While using my 1924 IHC wood box grain drill I found 2 disc that had become unbolted and fell off. After checking the rest of them I found 2 that were froze so I took them off. The discs are 12in dia and have a plate that has 5 of what looks like rivets head on them, but no indication of rivets on the back of the disc. I finally got the bolts loose that held the disc to the shoe, just one to a disc, then/now I wonder how to get them tightened again to the shoe as the bolt now turns freely in the mounting on the back of the disc. There is somewhat of a cap that goes around the hub that holds the bolt, and a leather dust washer inside of it/ I took them off. I just dont see how I can tighten the nuts back on the bolts with the bolt spinning inside the mounting on the disc. Any thoughts?