well, since i replaced the diaphram, this trimmer has been running pretty good. unfortunately, the plastic pull starter pulley has broken and just spins around. the "ears" or tabs that engage the motor have sheared off and it needs replaced. i have two older string trimmers, and being frugal i would like to try to salvage a pulley from them. one is an older weed wacker brand and one is a heap ryan. before i rip them apart, are the pullies fairly generic and maybe compatable or should i not even bother and just go and buy one?