A neighbor has an old riding mower I'm trying to fix for him. I took the gear box apart and found what appears to be a clutch collar broke in half. I cannot find what kind of rider it is. Here is everything I can find on the machine. On the body, under the seat is Model# 139-465-084 C309D. Serial# 41-010-9485. On the engine is Model# 190707, Type 1128-01, Code 78092710. On the transmission casing reads MTD. On the engine cowling is Turf King 8/34. There is no indication of manufacturer or date of manufacture. I'm at a loss and hoping someone here can give some guidance. Thanks. :help: