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A constant-pull stringing machine keeps pulling tension as the string stretches, which can help you get more consistent results than a lockout or drop-weight system. Of the five machines below, the GLOPTIX GT-E600 is the only one whose supplied product details explicitly confirm a constant-pull function. The Dunlop 3.0 has an electronic tension head, but its description does not confirm constant-pull operation. The other three use crank or drop-weight systems, so they are included as alternatives rather than confirmed constant-pull picks.
Quick Comparison
| Machine | Tension system | Notable features | Best fit |
|---|---|---|---|
| GLOPTIX GT-E600 Electronic Stringing Machine | Electronic; constant pull stated | 10–88 lb range, six-point mounting, 360-degree turntable | Shoppers who want a confirmed constant-pull function |
| Tourna 350-CS Premium Crank Machine | Manual crank, lockout | Six-point mounting, adjustable stand, 360-degree turntable | Stringers considering a sturdy crank system |
| GAMMA Momentum 2 Drop Weight Machine | Drop weight | Two-point mounting, floating clamps, compact base | Beginners who prefer a manual tension system |
| GLOPTIX GT-120 Drop Weight Machine | Drop weight | 15–80 lb range, six-point mounting, 360-degree turntable | Budget-minded stringers seeking a manual desktop machine |
| Dunlop Stringing Machine 3.0 | Electronic features; constant pull not specified | Compact body, pre-stretch and knot functions, tennis and badminton modes | Stringers who value portability and multiple settings |
Our Picks: Best Constant Pull Tennis Stringing Machines reviews
GLOPTIX GT-E600: The Clear Constant-Pull Choice
The GT-E600 is the most direct match for this guide because its supplied description specifically lists a constant-pull function. Its electronic tensioner covers 10 to 88 pounds, giving you a broad stated range for different stringing preferences. The machine also has an LED control panel with adjustable voice broadcasts.
A six-point mounting system and K-shaped racket grippers are designed to hold the frame at several points while limiting stress during stringing. The worktable rotates 360 degrees and includes a brake, which can help you position the racket and keep it steady as you work. The desktop format may suit a home stringing station, though the supplied details do not give its dimensions or weight.
The main advantage over the other listed machines is the clearly stated constant-pull function. The Dunlop has electronic features, but its description does not confirm constant-pull operation; the Tourna uses a crank lockout, while both GLOPTIX GT-120 and GAMMA Momentum 2 use drop-weight designs. A practical limitation is that the supplied information does not explain calibration steps, clamp type, or the warranty, so check those details before choosing it for frequent stringing.
Pros:
- Constant-pull function is explicitly stated
- Wide 10–88 lb tension range
- Six-point mounting and K-shaped racket grippers
- 360-degree turntable with a brake
Cons:
- Supplied details do not specify calibration procedure or clamp design
- Desktop footprint and included tool details are not fully described
Verdict: Choose the GT-E600 if you want a machine from this list with a specifically confirmed constant-pull function and a broad tension range.
Tourna 350-CS: A Crank Lockout Alternative
The Tourna 350-CS is a manual crank machine, not a confirmed constant-pull model. Its spring-loaded lockout tensioner pulls to the selected tension and locks, so it works differently from a constant-pull system that continues adjusting tension as the string stretches. It may still be worth considering if you are open to a crank setup.
The machine has six-point self-leveling mounting with a single-knob adjustment, CNC-crafted clamps, and a full 360-degree turntable with a brake. Its height-adjustable stand and included stringing tools offer a more complete workstation setup than the desktop-only machines listed here. The description also highlights quick-lock cams and a smooth base intended to make operation easier.
Its build and mounting features look useful for a dedicated stringing area, but the manual lockout mechanism is a key trade-off for anyone specifically seeking constant pull. The supplied product data also marks this model as unavailable, which may make it harder to purchase. Compare its current listing status and support details with the GT-E600 before deciding.
Pros:
- Six-point self-leveling mounting system
- Height-adjustable stand included
- 360-degree turntable with brake
- Stringing tools included
Cons:
- Crank lockout is not constant pull
- Supplied product data lists it as unavailable
Verdict: Consider the Tourna if you want a stand-mounted crank machine and do not require constant pull; skip it if that tension method is essential.
GAMMA Momentum 2: A Guided Drop-Weight Option
The GAMMA Momentum 2 uses a drop-weight tension system, so it is not a constant-pull electronic machine. Its design focuses on helping you follow the stringing process: red-marked touchpoints and decals identify key steps for placing the string, applying tension, and positioning the weight.
The die-cast aluminum base is described as low-profile and compact. A two-point mounting system holds the racket, while composite floating clamps grip the strings. The included large tool tray and protective pad can help keep a home work area organized. These features make the machine easier to understand at a glance, but a two-point mount differs from the six-point systems on the GLOPTIX models and Tourna.
For shoppers who are open to manual tensioning, its visual guides and organized tray may make the setup approachable. However, those features do not change the basic trade-off: a drop-weight system requires you to position the weight and is not listed as constant pull. The supplied product data also marks the machine as unavailable, so verify its listing status before planning around it.
Pros:
- Guided touchpoints and decals for key steps
- Compact die-cast aluminum base
- Tool tray and protective pad included
- Floating clamps are designed to grip strings while limiting damage
Cons:
- Drop-weight system is not constant pull
- Two-point mounting differs from the six-point options
- Supplied product data lists it as unavailable
Verdict: The Momentum 2 may suit a beginner who wants a guided manual machine, but it is not the right choice if you require confirmed constant-pull tensioning.
GLOPTIX GT-120: A Six-Point Manual Desktop Machine
The GT-120 is a manual desktop stringing machine with a drop-weight tension system. Its stated tension range is 15 to 80 pounds, and the six-point mounting system is designed to support the frame at several points. K-shaped racket grippers are also described as a way to reduce stress on the racket during stringing.
The 360-degree rotating table can make it easier to reach different parts of the frame without moving the whole machine. Because it is a drop-weight model, you should expect a more hands-on tensioning process than with an electronic constant-pull machine. It may be a practical alternative if you want six-point mounting and can accept manual operation.
Compared with the GT-E600, the GT-120 has a narrower stated tension range and no listed constant-pull function. Its product details also do not specify the clamp design or whether tools are included beyond the title’s general mention of tools. Those details are worth confirming if you are comparing it for regular use.
Pros:
- Six-point mounting system
- Stated 15–80 lb tension range
- 360-degree rotating racket table
- Desktop design for a compact work area
Cons:
- Drop-weight system is not constant pull
- Clamp details are not provided in the supplied description
Verdict: Pick the GT-120 only if you want a manual desktop machine with six-point mounting; choose the GT-E600 instead for the listed constant-pull function.
Dunlop Stringing Machine 3.0: Portable Features, Unspecified Tension Method
The Dunlop 3.0 is described as a compact, mobile stringing machine with a Diablo gripper set at a 20-degree angle. It displays pull tension in kilograms or pounds and includes selectable pre-stretch and knot functions. However, the supplied description does not state that its tensioning system is constant pull, so buyers looking specifically for that feature should confirm the mechanism with the seller before purchasing.
The machine includes a precision metal brake with automatic or manual control, newly designed clamps, and a mute option. It also offers tennis and badminton modes, plus adapters for tennis, squash, and badminton. A storage drawer, tool spaces, and a holder for an awl are designed to keep accessories close by. The product description says it can be set up by one person and used on a tabletop.
Its portability and range of settings stand out against the other options, especially if you want a machine that can handle more than tennis. On the other hand, the description does not provide a tension range, mounting-point count, or confirmation of constant-pull operation. That makes it harder to compare directly with the GT-E600 for a tennis-focused buyer who wants a clearly specified tension system.
Pros:
- Compact body designed for mobile use and tabletop setup
- Pre-stretch and knot functions
- Tennis, badminton, and squash adapters included
- Storage drawer and built-in spaces for tools
Cons:
- Constant-pull operation is not confirmed in the supplied description
- Stated tension range and mounting-point count are not provided
Verdict: Choose the Dunlop if portability and multi-sport features matter most, but confirm its tension method before buying it as a constant-pull machine.
How to Choose a Constant-Pull Tennis Stringing Machine
Confirm the Tension System
Do not assume that every electronic machine is constant pull. Look for an explicit description of the tensioning method, since electronic controls alone do not confirm how the machine behaves after it reaches the selected tension. In this group, the GT-E600 is the only model whose supplied details specifically state that it has a constant-pull function. The Dunlop has electronic-style functions and a tension display, but its constant-pull operation is not specified.
Check the Tension Range
Compare the machine’s stated range with the tensions you expect to use. The GT-E600 lists 10 to 88 pounds, while the GT-120 lists 15 to 80 pounds. A broader range gives you more flexibility on paper, but it does not replace checking that the machine suits your stringing needs. The supplied descriptions for the Tourna, GAMMA, and Dunlop do not state a tension range.
Look at the Mounting System
A racket mount should hold the frame securely while you work. The GT-E600, Tourna, and GT-120 list six-point mounting systems; the GAMMA Momentum 2 lists a two-point system. The Dunlop description does not state the number of mounting points. Consider the mount design alongside the racket types you plan to string, and follow the machine’s setup instructions to avoid placing unnecessary stress on a frame.
Compare Clamps and String Handling
Clamps hold strings in place while you move through the string bed, so their design can affect how easy the process feels and how well the string is held. The Tourna description specifies CNC-crafted clamps with a sandblasted surface, the GAMMA lists composite floating clamps, and the Dunlop mentions newly designed clamps. The GT-E600 and GT-120 descriptions do not give the same level of clamp detail, so check the listing or ask the seller if clamp specifications matter to you.
Choose a Desktop or Stand-Mounted Setup
Consider where you will string rackets and how much space you have. The GT-E600, GT-120, and Dunlop are described as desktop or tabletop options. The Tourna includes a height-adjustable stand, while the GAMMA emphasizes a compact, low-profile base. A stand can create a dedicated workstation, while a desktop machine may be easier to fit into a smaller area; confirm the machine’s dimensions before setting aside space.
Consider Features That Match Your Routine
Extra features are useful when they solve a real problem in your setup. The GT-E600 has an adjustable voice broadcast, and the Dunlop lists pre-stretch and knot functions, a mute option, and multiple sport modes. The Tourna includes a brake and quick-lock cams, while the GAMMA adds visual guides and a tool tray. Focus first on the tension system and frame support, then compare these extras.
Check Included Tools, Support, and Availability
Supplied descriptions do not provide complete information about calibration, warranty coverage, or long-term service for every machine. Verify those points before buying, especially if you plan to string rackets often. Also check the current listing for availability and included accessories: the supplied product data marks the Tourna and GAMMA as unavailable, but listing status can change.
Frequently Asked Questions
What does constant pull mean on a tennis stringing machine?
Constant pull describes a tensioning system that continues to pull as the string stretches, rather than locking at the initial pull. It is one way to maintain tension during stringing, but the machine’s setup and proper use still matter.
Which machine in this list explicitly states that it has constant pull?
The GLOPTIX GT-E600 is the only machine in this list whose supplied product details explicitly state that it has a constant-pull function. The Dunlop 3.0 has electronic features, but its description does not confirm constant-pull operation.
Is a crank lockout machine the same as a constant-pull machine?
No. The Tourna 350-CS is described as having a spring-loaded manual crank lockout tensioner. That is a different system from the constant-pull function stated for the GT-E600.
Are drop-weight machines constant pull?
The GAMMA Momentum 2 and GLOPTIX GT-120 are described as drop-weight machines, not constant-pull electronic models. The tension method is different, so choose one only if you are comfortable with manual tensioning.
Is a six-point mount necessary?
A six-point mount supports the racket at more points than the GAMMA’s listed two-point system. The supplied information does not establish that one mount style is right for every player or racket, so compare the machine’s mounting instructions with the frames you plan to string.
Can the Dunlop 3.0 be used for sports other than tennis?
Its supplied description lists tennis and badminton modes, along with adapters for tennis, squash, and badminton. If you need a confirmed constant-pull system, ask the seller to verify its tensioning method before choosing it.
Final Recommendation
For shoppers specifically seeking a constant-pull tennis stringing machine, the GLOPTIX GT-E600 is the clearest choice in this group because its product details explicitly name that feature and provide a 10–88 lb tension range. The Dunlop 3.0 is worth considering for its compact design and multi-sport functions, but its constant-pull operation is not confirmed. The Tourna, GAMMA, and GLOPTIX GT-120 are alternatives for shoppers willing to use crank or drop-weight tensioning instead.