Just based on my experience, the steel pin clevises of various flavors seemed to always wear the plastic control takeoff parts. I first went all nylon about 8 pattern airplanes back, and use them exclusively now, even on my 2M pattern planes. Amazing how long these nylon to nylon parts will last with no wear.

Try it; it doesn't seem to work for everyone, but that's why there's like 10 or more brands of control horns and clevises out there.