I have a Logan 820 lathe and recently the drill chuck shank has started slipping (sporadically) in the tailstock. I've been search the web and see a lot of discussions but most say replace or ream the tailstock. As a neophyte, I'm thinking some basic TLC might be the place to start. What is the "approved" maintenance on the tailstock? I've wiped-down to chuck shank and the inside of the tailstock, that helped but didn't cure the issue. Is it okay to take some emery paper and lightly sand the surfaces?