I used to have the same problem big time, I'd have to stop in the middle of a run to screw the lever back out. I called hayes, the tech suggested lock tight, the least strong color, blue I think, and in the lipstick type applicator not the liquid. You should be able to find the lock tight at a hareware store. Unscrew the adjuster all the way out so you can get to the threads and put a little on. And if you do have to use the liquid be careful not to get it on anything other than the threads. The tech said they know about the problem, and I imagine that they have fixed the thread spacing on the new HFX's.