I have two with stock setups that I have been flying for two years without problem. Dave hit the nail on the head ... make sure the metal to metal surfaces are greased. Also, check to make sure you haven't lost the e clips regularly. If you aren't careful getting them on and they get stretched, they can depart the pin.

I am using a Powerbox Champion to mix on one and a matchbox on the other.

Echo the thoughts on the paint scheme ... love it.