Quote Originally Posted by Peter Simpson View Post
Dads...and Loctite (242, I think - removeable, it's blue in color). Get a small bottle at your local auto parts store. Use a toothpick to put a tiny bit on the threads of the screw so it doesn't happen again. I use it on lots of stuff where unscrewing would be problematic. Like the bolts that hold the rear carrier to my bicycle. It doesn't like plastic. Great stuff.
Pros use nail varnish after knob is screwed down, easier to undo after nail varnish remover qtip scurbbing hard. But the knobs normally don't loosen off as they tighten with use, checking they are tight is still a good idea.