My problem is two-fold.

First, I have had an ongoing problem with the small washer/spring pin hole thing (not sure what it's called, photo below) rotating on the brake boss stud. I think I've solved it by cranking down the boss/stud as tight as I dare, but I've thought that before and it ends up loosening when I tighten the actual brakes on the boss. Any tips on getting that thing to stay still? Seems like a silly system - not sure if ALL cantis use that same plate or if it's just my shorty 6s.

Second, upon disassembly for inspection, the little pin on the spring kit that fits into the part that is rotating (photo below) fell out of the spring assembly and disappeared into thin air. I've checked ebay and the rest of the interwebz, but no replacement kits seem to exist for the shorty 6. Anyone have any ideas on anywhere else to try and find a replacement pin?

Lastly, I've considered just buying some shorty ultimates, but if they use that same spring-pin-washer-thing and it still rotates, I'm right back to square one minus $200.

Thanks for reading my wordy and poorly worded questions!