Strange question. My 350 has a different crank shaft end on it so I can't put a 3/8 clutch and wormdrive on it. It is different from my 346xp OE which has a 3/8 clutch and wormdrive. I was hoping to make the 350 into a 3/8 since it is a nice little screamer and I have all 3/8 bars on everything I own. The crankshaft end just will not accept the plastic wormdrive. Any help would be appreciated.