RE: Check those servo arm screws!
Re Loctite: I put the smallest amount I can on the thread of the bolt, and whipe it off so it is only inside the threads just barely. I do this for two reason. One is so it doesnt get on the plastic arms and two, too much loctite will make getting that bolt back out a real PITA. I usually only get it on the first couple threads as well.
I'd be willing to bet it was never on there. It happens!