[blykins]

Shot you an email back....

For one thing, I'd like to know why you don't think you have enough preload. It shouldn't have changed.

The other thing is, this isn't a non-adjustable system. This is a fully adjustable roller rocker arm, with a guideplate, rocker stud, and polylock.

To adjust preload, you go to zero lash, then dial in how much preload you want (1/2 turn, 3/4 turn, etc.) with the big nut, then tighten up the set screw in the middle.