Don't use theadlock on the wood, it won't work in that application. Any metal to metal connection however could benifit from the locker with a few expections. If the servo hold down screws are backing out of the wood try to harden the holes with some CA then see if the threads grab better. If that doesn't help and the holes are really wallowed out you might be able to find different screws that work better or you can also glue a toothpic in the hole and then redrill, etc.