Originally Posted by JohnWayne
Depending on how worn your set screw is it shouldn't take a lot to stop the TPC from moving. I always set my TPC where I last chronod and then screw in the set screw,
Problem is that the set screw is hard to access while it's inside the body. This also means you have to unscrew it everytime you adjust your velocity.
I bought about 10 nylon set screws from CCI a couple weeks ago. They're pretty cheap and hardly ever wear out if used properly.