thats really very unfortunate,,,,,,,,,,,,,,,you havent gave a look at its condition during engine overhaulling ?................its made of teflon plastic and it cant break the metal,,,,,,,,,,,i think the whole gear inlcuding its shaft with which it is mounted on the engine block gave away,,,,,,,,,,,,,,,may be thats because of improper governor lever adjustment ,,,,,,,,,,,,,