GREAT thread, lots of laughs. Many mechanics here have been wrenching for a while, myself included. Thus you know the importance, or lack thereof for facing, chasing, tapping, slapping, and whacking. IMHO do what is necessary to insure the enjoyment of your bicycle. Replace parts that have gotten their FAIR use. If the part did not fulfill a fair lifetime or quality, then perhaps you may need a face, chase, tap, slap, or whack.