Most definitely. Those that say to "just rip 'em out" are giving bad advice. Too many people will make the mistake of starting to just replace parts instead of diagnosing the problem and fixing it correctly. For instance, your instructor recommending replacing BOTH the rudder and elevator pushrods when you are only having problems with the rudder. That definitely falls under that category of "If it ain't broke DON'T fix it". Follow the advice of Bruce and Ptmac3 and figure out what is causing the rudder to not bind. I've build the LT-40 as well as have instructor a lot of people using that plane and there is nothing wrong with the setup Sig has for the pushrods.

Ken