[commercialcobb]

I found the exploded view of the 9" on google.. But a guy that wants me to pay him to do it said if I don't get it right, it will whine and vibrate.. Did he say that so I'll pay him? Do the gears need to be timed or just fitted together?? I need to do some more research but just wanted to see if there were any whistle blowers in here with a good reason not to attempt it by myself..