Hi, I've just joined this forum. I have a Craftsman 259060. Old now but has done great work mowing 7000 square meters (1.80 acres). I am now refurbishing the cutting deck with new Mandrel assemblies, blades and clutch cable. So far so good with minor problems with rusty bolts etc. I have a query/problem with the mandrel assemblies. The holes for the attachment bolts are not threaded and I only have bolts supplied. Are these self tapping ? or has the mandrel casting not been threaded.