I wouldn't use thread lock on control clevises. You'll want to adjust them for trim. You should put a piece of fuel tubing over the clevis to keep it closed.

I use thread lock on things like wheel collars, engine mounting bolts - anything that could cause serious damage if it were to come loose.

I don't use it on the screws that hold the engine together, but I re-tighten them the first time the engine gets hot. They usually stay tight after they've been tightened hot.

Good luck