A tiny drop of green (wicking) Locktite should take care of such problems. When I assembled the
Hardrock 50 amp, for example, every screw got a little drop of green Locktite.
To explain:
Locktite 262 is red, and is "permanent". Not really, you can get it off by heating with a torch. Put this on stuff
you want to never, ever come apart.
Locktite 242 is blue. The container is red, but the juice is blue. This is sometimes called "gunsmithing Locktite."
It is applied to screws and nuts prior to assembly, put on immediately. It is "service removable". Some think the
white powder from such a screw is corrosion. It is not. The powder is the Locktite residue from removal. Use
this for scope mount and base screws.
Locktite 290 also comes in a red container, but is very thin and green. It will wick into already assembled screws
and nuts. Often used in electronics, not only screws and nuts, but trimmer pots and caps, on the adjustments.
Locktite 290 is also "service removable".
I keep all three of these above on the shelf above my work area.
Locktite 271 and 272 are also red, and are "high temperature" thread locker. "Permanent."
Loctite 222 - aka "purple" Loctite is also "service removable", and not as strong as 242 ("blue"). Great for set screws,
other small fasteners. "Designed for precision metal fasteners under 19mm." Also good for gun smithing.