RE: Beware of O.S.
This is a general observation, and doesn't apply to this situation. I have been flying for 12 yrs. One thing I have noticed is that as more people come into the hobby, we get more people who want to bolt it on and fly. Like buying a gas engine and not even trying to tune the needles. They think the engines are set to "factory specs". I just don't trust the little Chinese guy to assemble the engine properly. Most do, but some don't. I'll do my own checking, and have peace of mind that it, at least, was correct/tight/clean when it was installed. This is just part of the assembly procedure for me. I enjoy the tinkering and checkout. Some don't.