I'm building a occ chopper stingray for a guy and I've searched and searched forever and can't seem to find if it just makes the install easier or if it is a must have. Already realize that my motor mount plate has to be off center to the left of the bike. Is the adaptor used to compesate for the drastic angle of the spokes? I wouldn't have posted, but not having any luck reading through all the search results and the guy is getting antsy. Thanks in advance!