Atlas has dedicated set for $55
Otherwise, buy 2 stainless pins, use one as a male fitting for shafts, and modify the other pin to be a tap, then cut your own female unit, and then you can also cut your own threads, for a whole lot less than the $400 tap for a total of $26+ shipping.....http://forums.azbilliards.com/showpost.php?p=5821119&postcount=3