I tore it down, and it doesn't look very good. The pieces of inner tube serving as friction discs should have been my first clue.

The plate that gets sandwiched between the 2 fiber disc is worn VERY thin, and is dish shaped. According to my Hesston 4500 parts book, this plate bolts on, so maybe it can still be bought. It looks simple enough that one could be made fairly easy.

The front plate that the springs push against is a little distorted from over tightening, and a little dished, but I think I could make it usable with a little time in the press.

The plate that bolts to the flywheel would probably be usable, but does have a little wear where the friction discs go. The stud that all of this mounts on is in good shape. The springs are good, but I'd go with new bolts to retain them.

So, are you still interested? Do you want everything from the yoke on back?