I'm finishing up my "SS" mini bike project and am putting together the HS40. It was a "freebie" and guy said it had no spark. I found out why, chipped off magnets on the flywheel. So I have a new one coming and am wondering if I need to do anything special with putting it back on. is there a wrong way? Is there a mark to line up? What is an easy way to tighten the thing down? Thanks for the help.