Hi Chris, I had a broken reverb spring in my 84-50. I replaced it with an Accutronics 8BB2A1B, which I had from an old Musik Man RD 110-50, and it worked. I have a question. I contacted Seymour Duncan an asked them to send me a schematic, but they did not respond. Would it be possible for you to send me the schematic vie e-mail, (as pdf)? Thanks Hermann