How to Adjust a Cobra Aerojet Driver: MyFly Settings & Weight Adjustment Guide
To adjust the Cobra Aerojet driver, use the MyFly8 hosel ring and the movable weight system. The hosel changes loft and face angle simultaneously; the two weights (12g heavy, 3g light) shift spin and forgiveness. Start by turning the hosel ring to your target loft/face setting, then move the heavy weight forward for lower spin or back for more forgiveness. Tighten the weight screw to 35 in‑lbs using a T20 bit. Do not overtighten.
If you need a specific shot shape or trajectory, use the combos in the chart below. For models without movable weights (Aerojet Max is fixed draw‑bias), only the hosel adjustment applies.
Quick Settings Chart
MyFly8 Hosel – 9° Head (adjusts 7°–10°)
| Setting | Loft | Face Angle | Flight Effect |
|---|---|---|---|
| Lo | 7° | 2° open | Low launch, fade bias |
| Lo+ | 7.5° | 1° open | Lower launch, slight fade |
| STD | 9° | Neutral | Neutral flight |
| STD+ | 9.5° | 0.5° closed | Slight draw |
| D | 10° | 1.5° closed | Draw bias |
| D+ | Not available on 9° head | – | – |
MyFly8 Hosel – 10.5° Head (adjusts 8.5°–11.5°)
| Setting | Loft | Face Angle | Flight Effect |
|---|---|---|---|
| Lo | 8.5° | 2° open | Low launch, fade bias |
| Lo+ | 9° | 1° open | Lower launch, slight fade |
| STD | 10.5° | Neutral | Neutral flight |
| STD+ | 11° | 0.5° closed | Slight draw |
| D | 11.5° | 1.5° closed | Draw bias |
| D+ | 11.5° (max loft) | 2° closed | Strong draw |
Weight Position Effects
Set the heavy weight (12g) and light weight (3g) as follows:
- Heavy forward, light back: Lower spin, slightly lower launch. Best for reducing ball flight into wind or for players who already launch high.
- Heavy back, light forward: Higher launch, more spin, increased forgiveness. Helps maximize carry and stability on off‑center hits.
Models: Aerojet (balanced) and Aerojet LS (low spin) have movable weights. Aerojet Max has a fixed draw‑bias weight and no adjustment.
Step-by-Step Adjustment
Tools Needed
- Cobra torque wrench (or any T20 bit torque wrench set to 35 in‑lbs)
- No other tools required – weights and hosel ring are tool‑less
Procedure
- Remove the existing screw (T20) from the weight track. Turn counter‑clockwise. Set the screw and washer aside.
- Slide the heavy weight (12g, marked) to your desired position – forward for lower spin, back for higher forgiveness.
- Replace the 3g light weight in the remaining slot. Ensure both weights are fully seated in the track.
- Reinstall the screw and tighten to 35 in‑lbs using the torque wrench. Do not guess – overtightening can strip the threads; undertightening risks the weight coming loose.
- Adjust the hosel: Loosen the hosel ring (turn it left until it stops). Do not remove it completely.
- Rotate the ring to your chosen setting (e.g., D for draw, STD for neutral). The numbers/letters align with a notch on the hosel.
- Tighten the hosel ring by turning it right until snug. Do not use the torque wrench on the hosel – hand‑tighten only (no torque spec listed by Cobra; a firm turn is enough).
Branch: When the Weight Screw Doesn’t Seat Properly
After step 4, check that the screw head sits flush with the sole. If it sits above the surface or feels loose, the weight track may be obstructed or the washer is missing. Remove the screw, inspect the track for debris, and re‑seat the weights. If the screw still won’t sit flush, stop – do not force it. A raised screw can catch on the turf at impact and damage the head. Use compressed air or a soft brush to clean the track, then try again. If the problem continues, the track threads may be damaged (see stop threshold below).
Success Check
After step 7, verify the hosel ring is fully seated and the weight screw is flush. Hit 3–5 balls on a range or monitor to confirm launch and spin numbers. If the ball flight is drastically different from expected (e.g., extreme hook or slice), re‑check your setting.
Stop Threshold – When to Stop DIY and Seek Support
Stop adjusting and contact Cobra support or a certified club fitter if you see any of these warning signs:
– Stripped screw threads – the screw spins without tightening, or the T20 bit slips in the screw head.
– Crack in the sole or hosel – visible damage around the weight track or hosel ring.
– Hosel ring will not rotate smoothly – if you feel grinding or resistance when turning, stop. Do not force the ring; internal threads may be cross‑threaded or a debris jam exists. Attempting to force it can crack the hosel.
– Weight track won’t hold the screw – if the screw backs out after a few swings, the threads are likely stripped. Replacement parts (screw, washer, or entire head) are available through Cobra; do not continue using the driver in that state.
These issues are not DIY‑fixable without risking further damage. Cobra’s warranty covers manufacturing defects; damage from overtightening may not. Verify local policies.
Common Settings (Draw/Fade/High/Low)
| Desired Flight | Hosel Setting | Weight Position | Model Note |
|---|---|---|---|
| Draw | D or D+ (higher loft + closed face) | Heavy weight back (more forgiveness/higher launch) | Aerojet Max already draws – use STD or Lo if you need to straighten flight |
| Fade | Lo or Lo+ (lower loft + open face) | Heavy weight forward (lower spin, lower launch) | Best on Aerojet or LS; Max may fight fade due to fixed draw bias |
| High launch | STD+ or D (add loft) | Heavy weight back | Increases spin and launch angle – ideal for wet fairways or slow swing speed |
| Low launch | Lo or Lo+ (remove loft) | Heavy weight forward | Reduces spin for piercing flight – good for windy conditions |
If you want both draw and lower spin (e.g., a draw that doesn’t balloon), use a D setting with the heavy weight forward. This closes the face but reduces spin – a moderate draw that stays low.
Practical judgment: If you’re a higher‑handicap player seeking consistent distance, start with the heavy weight back and the hosel at STD. That gives the most forgiveness. Only move the weight forward after you’ve confirmed on a launch monitor that your spin is too high (above 3,000 rpm with driver). Lowering spin without increasing swing speed can reduce carry if your launch angle drops too much.
Torque & Tools
- Screw size: T20 (Torx #20). Identical to many Cobra drivers and fairway woods.
- Torque spec: 35 in‑lbs (4 Nm). Never exceed this.
- Wrench: Cobra includes a torque wrench with most Aerojet drivers. If lost, buy a quality T20 torque wrench set to the correct value. Do not use a standard screwdriver – you cannot control torque.
- Safety: If you feel resistance while tightening, stop. Cross‑threading or over‑torquing can damage the head. If the screw is stripped, replace it (OEM parts vary; verify locally).
Why 35 in‑lbs is non‑negotiable: The track is machined into a titanium or carbon‑composite sole. Over‑torquing can deform the slot, making future weight adjustments impossible. Under‑torquing allows the screw to vibrate loose and could cause the weight to slide mid‑swing, altering balance mid‑flight.
FAQ
What does the MyFly8 setting actually change?
It adjusts loft and face angle simultaneously – higher loft settings also close the face (promoting draw), lower loft settings open the face (promoting fade). The face angle change is roughly 0.5° per setting step.
Can I adjust the weight on an Aerojet LS?
Yes. The LS model uses the same sliding weight system (12g and 3g). LS heads are slightly lighter overall to keep swingweight balanced. The weight track is identical.
What torque should I use for the weight screw?
35 in‑lbs (tighten fully with a torque wrench). Hand‑tightening is not recommended – the screw may back out during play.
I don’t have a torque wrench. Can I just hand‑tighten?
Not advised. Without a torque wrench, you risk undertightening (weight slips) or overtightening (stripped threads). Purchase a compatible torque wrench or borrow one. Many golf retailers will tighten it for free.
Does the weight position affect sound/feel?
Yes. Heavy weight forward produces a firmer feel and slightly louder impact; heavy weight back feels softer and more muted. This is normal and not a defect. Some players prefer the forward position for feedback, others prefer the back for comfort.
What if I want a fade but my Aerojet Max is draw‑biased?
Use the Lo or Lo+ hosel setting (open face, lower loft) to counteract the draw bias. You cannot change the weight on Max – it is fixed. The Max head also has a slightly heavier heel‑side weight, so even with Lo+ you may still see a slight draw. If you need a consistent fade, consider the standard Aerojet or LS model.
Can I swap weights between different Aerojet heads (e.g., put an LS weight in a standard head)?
No. The weight sets are matched to the head’s total mass to maintain swingweight. Using a non‑original weight can throw off balance and may not fit the track. Use only the weights that came with your driver.
The adjustments above will let you tune launch, spin, and shot shape in about five minutes. Always verify your final setup with a launch monitor or on‑course feedback before committing to a setting. If you run into any of the warning signs listed in the stop threshold, stop and contact Cobra support.
Michael Reeves is a PGA Professional with over 20 years of experience in competitive golf and instruction. A former Division I collegiate player at the University of Texas, he competed on the mini-tours before transitioning to full-time coaching and golf journalism. He has been a certified PGA teaching professional since 2005 and has worked with players at every level, from absolute beginners to collegiate champions.
His writing has appeared in Golf Digest, Golf Magazine, and The Left Rough. At GolfHubz, Michael leads the editorial team, overseeing fact-checking and ensuring every answer meets the same standard he demands on the lesson tee: clear, evidence-based, and immediately useful.
When he’s not writing or teaching, Michael plays to a +1.4 handicap at his home club in Austin, Texas. He has attended over 40 major championships as a journalist and fan, and has played more than 200 courses across 15 countries.
You can reach Michael at [email protected] or follow his occasional swing analysis posts on the site.