OK, so it seems that I have lost the oring for the extended fuel screw. I have the ThumperTalk FCR Extended Fuel Mixture Screw by Kientech and I dont like it. Its a pain to turn and does not fit the SM because the starter motor gets in the way. When I removed the screw I had to but a lot of pressure on the carb. I want to replace this screw with one that fits the SM with a DRZ400 FCR-MX 39mm Conversion Kit. I do not want to remove the carb in order to fit the screw. What would you guys suggest as a replacement? I need the screw and oring.