I had a metal JR arm(star washer with centre bolt and clamp bolt) pop off an aileron servo in the early flights of my Sbach. I added a little blue loctite to everything after that and no issue in the subsequent 4 years.
Tales of servo woe might be indicative of lack of maintenance (I plead guilty too). Star washers flatten and aluminium and plastic squashes so it really should be a compulsory check that all screws are tight at the beginning of every flying session. Loctite (blue) may only mask the problem as a loose arm will soon strip its splines even if the screw doesn't come loose any more.
Not wishing to hijack an informative thread about Mythos Throws I can own up to a tiny drop of blue on the Beasts rudder servo after the ally arm fell off. Never had an issue with hd plastic arms though, probably a tighter fit on the splines.
PhilF51 wrote: Chris - Do not loctite the locating screw. Read the info on metal gear servos! Just make sure you have the star washer underneath the screw head and tighten. If you have to return the servo due to failure they will throw it back at you when they spot the blue.
Make up your mind, you were the one that said not to use any :silly: