Loosen nut untill the threads are about flush with shaft. Have the flywheel clamped lightly in a vise. Then tap on end of shaft with a hammer. It will pop loose easy. Do not pound on it ...if you got fly wheel clamped good or supported good from the backside...it works easy. If you do mot have a vise big enough...support the flywheel from the back-side with a couple metal bars. Capt,n