ORIGINAL: Gray Beard
For myself, I haven't ever lost one. I run in the engine then just tighten the screws up while the engine is still warm. I never use any locking compounds because I have had problems in the past removing screws when needed.
A lucky man.
I've had some applications if loctite wasn't used, you could tighten as much as you dare and it would be loose before your out of fuel. Yes things were in balance. This is usually on higher than normal rpm situations. K&B outboard engines where the engine wants get off the lower unit, pylon racing engines, Viper Quickie 500 wing screws to name a few.
Never had a problem with removing a fastener using blue (removable) loctite if the fasteners or tools weren't rounded off to start with. Red loctite is a different story!
Where needed, blue loctite is just standard operating procedure for me on all my planes, trainers to 180 mph deltas.
Just one less thing I need to worry about...you see, I'm not a lucky man...I know Murphy's Law quite well.