Jumping ship from the mill side and hoping you lathe guys can help me. I have an 1100M Mill and am about to bring in a job for some turned parts (small brass bits that my spindle can easily manage). I want to build a gang tooling block to hold my profiling tool on one side, parting tool on the other, and two drills mounted in chucks in the center. Ideally I'd like to not buy new drill chucks as I already have a few with TTS ends. I assume to fixture them I simply need an appropriately sized hole with a couple set screws to grip the shank but I'm concerned that I will mar or otherwise damage my tool holders making them useless when I go back to traditional milling. Is there something that is done in gang tool holders to prevent that sort of shank damage? Soft metal set screws perhaps?