I talked to John at the Carburetor shop today and he said that piece is nearly always broken and when he builds one of those he machines a new one. He said he wouldn't make them to sell. He did give me something to try on the RT-08 so I will do that and see if it fixes it. If it does I'll share the tip here. I may be able to get my son to make the piece for the BB-1 but to get it off so he can copy it I may have to cut it as I worked for a couple of hours on it and never did get it to come off. It has to have it because the idle stop screw hits on the tab on it so without it the idle speed couldn't be set. Pate Swap meet is in a few weeks so maybe I can find something there. Oh yeah my JB weld repair didn't work