I have given in to the temptation of a Shelix cutter head for my old jointer: a 1960's era Rockwell/ delta 37-315. The Byrd replacement arrived in about a week. So today I'm dismantling the old one. I have removed the nut and pulled the shaft from the bearings one one end. The other end is not yielding to my gear puller. Is there a mechanical fastener holding the shaft and bearing together? There is no obvious nut.