Here is a video that should help. The Yamaha helix is held on by 3 nuts, not screws like in the vid. But you'll see the similarities. Also, you don't need that tool they use if youve done it before. You also could make your own tool with threaded rod. It definitely makes it easier. I probably wouldn't recommend trying it without some sort of tool if you've never had a secondary apart before. Then once apart, the helix will have numbers on it, as will the clutch. The total degrees is a combination of both numbers the spring is placed. So if you have it in hole 3 on the helix and hole 3 on the clutch, that's 60 degrees. (3+3=6) then add a 0 to get 60. Add zero to whatever combination to determine degrees. So if you want to tighten it, take it to 70 degrees, and if you want to loosen, take it to 50 degrees. So after you get your desired degree, put it back together the same way it came off. Now, know that it's a torsional spring so when you take it apart, when the helix clears the towers after the nuts are off, it's going to twist to the left, or unwind. Note how far it twists because you will need to twist it back into place when your reinstalling. This is super hard to explain without showing you, so hopefully this video will help a bit.
