Dragos,

Jerry is giving you good advice for your concerns.

On the other hand, unless you are flying high performance models, a little slop in the pushrod tube probably won't make much difference. I have had planes with the bushing as Jerry described and planes with the pushrods inside the tubes without bushings. IMO not enough difference to notice.

Having said that, my flying style is very conservative. I am not a 3D flyler.

DaveB