I got a used 6 1/4" three jaw chuck a couple of years ago. It has always required a lot of effort to open or close. I took it apart and cleaned and lubricated it when I first got it and everything appeared normal. I've got it apart again now and the all the jaws are tight in all the slots of the body; to the point I can't move them with my hand but have to rap them with a soft-faced hammer.
Question: If I lap the jaws to the body am I going to regret it later?
Roger in Vegas Worlds Greatest Impulse Buyer.