I have a 66 41C with an older Pompanette fighting chair and I need a part for the deck plate. The plate has a locking collar that screws on the top and has a screw on the side to clamp on the pedestal post. Pompanette said they havent made it that way in years and have no suggestions. Its about a 3.5 inch diameter. Any suggestions? I am trying to get the old one fixed but I want to get a second for the chair so I can position it farther back.