The headset on my fixed gear bike is always coming loose (I get a little "knocking" when applying the front brake and pushing the bike forward). I've never really had this problem on threaded headsets before. I greased it, but it seems like I have to tighten the lockring/adjusting cup every other ride. Should I try a little blue loctite on the threads of the lockring? I'm hesitant to get this stuff anywhere near bearings, so I'd like to avoid having to use it. Am I missing something?