While building an Ultra Stick .60 if you install the servo's according to the book, you get wire keeper clips to attach the pushrods to the sorvo's with. I had never used them before and they seemed a little scary to use but I gave them a chance because the hobby store was closed and I wanted to fly. Since then I've noticed on one occasion that one unsnapped easily and fell off just transporting the aircraft to the field and on another occasion I noticed my aircraft would try to roll if I put the flaps down. You guessed it, I had one pushrod dangling from a flap where the clevis had fallen off in flight. I'll never use them again and personally I think they're dangerous and should never be used. Do they have a place or should they never ever be used?