I recently took the rear wheel off my 2008 road king removed the bearings and had it powder coated. the bearings were good so i reinstalled everything as it originally was and torqued it to specs. now after about 50 miles my belt loosens up. the axel bolt is still tight but you can see that it has rotated because there is a gap at the cam spacer and the belt is loose. Readjusted it 4 times but it keeps happaning. Any sugestions?