I would polish them if there are rough spots or burrs.
I don't think I would put a hardening coating on them--what tends to happen with coatings on screws (not talking cue pins specifically, rather screws in general) is that the coating chips off, stays in the threads and acts as an abrasive or binds the action.
dld
I do agree that if you put any clear or something on, naturally it would wear off.
Would do some experimenting on this to see how things performs-my first idea would be raw pollishing and then some wax on shaft and pin:smile:
Is that Double Dave by the way-or do I mix ?
K