Suggestion, try a tiny spot of Hernon128 Blue thread locker or Gorilla Super Glue. Surprisingly useful addition to the OTG toolkit.
"...128 Blue Thread locker – Viscosity 80cP. Fills gaps to 0.004″ (.102mm) Low strength Cyanoacrylate...
I have OCD so always do my pre-flight checks, today it paid off in a big way I found one of the prop screws had backed off about half a turn this may never have come all the way out but knowing my luck it would have and I would have had a bad...