Mike, the control hardware in the Top Flight kit is weak. Basicly, the bellcrank, and clevises are the weak links. I was able to pull the hinge pin out of a clevis with almost no effort with a pair of needlenose pliers. I also replaced the bellcrank and leadouts, at the strong suggestions from other that learned the hard way. If I remember correctly, the leadout cable was sawing thru the bellcrank on some airplnes, and I think the crimps were causing some headache as well.
Flying Models magazine (dont remember the issue) had a good article on all the Nobler improvments that were being done, and there should be lots more others can tell when they read your post.
I am useing stock control horns, and pushrods on mine. Sullivan clevises and leadouts on a Sig 3"bellcrank are the only replacments I made to my Nobler. It flew great until the wind did me in.
Good luck with your Nobler,
Greg