The screw that attached the shifter shaft to the shift mechanism in my Rennshifter continually loosens, resulting in a vague shift. However, if you tighten in too much it, it stiffens up the whole mechanism.

I'm currently having to check & retighten it every 1 or 2 races. Very annoying.

I thought I would try Loctite - what colour/type should I use? Pretty sure all parts are stainless steel.