I put a new endpin in this little 5/8's bass I have. Problem is that you guessed it, the ebony was too big in diameter to fit the socket. After hand sanding for an hour i had an idea. I fashioned a jig from a piece of 5/16" hss steel then added a stop at the end and an adjustable collar that will adjust to fit a variety of endpins. Put the endpinsocket on the jig, put the jig in the drill. Turn on the drill and apply sandpaper. Worked like a charm and the endpin was ready to go in 15 minutes with a perfect fit.