Can I use a "13mm" ER20 collet to grip a 1/2" tool?
My 3/8" collet is definitely 0.375, so a 3/8" tool is snug. But a 13mm collet is .512"... is that too sloppy to hold a 1/2" tool? I know collets have a "grip range", but I want a tighten-and-go solution, without having to check for runout.