I finally got my hands on some pin nocks and the currently produced pin nocks will fit on the adapters. The older pin adapter have ridges that won't allow the nocks to fit onto the adapter. The good part is that the ridges can be filed down to accept the current pin nocks. I chucked the adapters in a cordless drill and put a file to them and checked nock fit frequently during the process. Now I can use my old stock of AFC 2400 arrow shafts without having to deal with cutting off and gluing nocks to get fletching clearance.