my idler gear is solid while some have holes in them making them more light weight but im seeing that a solid one is year 70 and hole one is year 69.  did some of the 69s come with a solid gear?  i went ahead and ordered a holey gear that said 69.  iv been missing the wave washer causing gear to mess with the clutch but now im wondering if its the gear too?  kinda a hard question.  would i be better off with a solid gear but i know racers would want holey one. thx