Is your Crank out of round or out of spec? Does it have deep scratches as described in the DVD? You need it reground. We can do it. Perfect everytime without having to disassemble the flywheel. Use undersized shell bearings available here in the FOUR ACES MOTOR SHOP. Triumph, BSA Norton, 750cc, 650cc, 500cc. Oddball stuff too. Does not include return shipping.