I usually make my own servo trays, I can customize them and build them the way I want to so that I can mount them a certain way or whatever the situation may be.

I got a trainer from my grandpa (years ago) that he had built, and it still had the old 1/4 balsa square pieces for the elevator and rudder pushrods. He put a coat of just plain fiberglass resin to make them fuel proof and stiffen them up, and they are still the originals today. So, I got balsa pushrods that still work great that are 20 plus years old, so there is nothing wrong with them.

I will agree with everyone else though,  don't use them, use pull pull or a sullivan or great planes pushrod.

Jason