Well ok the first thing u want to do is jam the flywheel with a screw driver this allows you to work without the engine spinning freely. Well for my friction shaft i used a normal bicycle peg i would recommend using a 3 inch peg because i used a 4 and that was way too long. The engine i was using has a 5/16 keyed shaft. This was extremely difficult to work with considering it was only 1 inch long and u have 2 fit alot of stuff on it. The pattern i used to lock every thing in place was in this order a skateboard bearing, bike peg, lock washer, nut. This pattern seemed to work very well.