Originally Posted by
SquidPuppet
It's not the lock nut coming loose. At least not on my bikes.
I don't use loctite at all. Just some grease on the threads. The
assembly itself never works it's way loose. Once I tighten everything down, it remains tight forever. It's only the
feel of the adjustment that changes. Nobody is 100% sure why, but one piece cranks are notorious for this.
Even Sheldon Brown and Jobst Brandt acknowledge this phenomenon. And offer no remedy.
Come on, SquidP, you know that there are no unexplained phenoms in mechanical engineering. You've been spot on with all the previous instructions so this is shocking. I'll debunk this mystery with a micrometer, photos, and large blocks of time.