I wondered about that... if they fly off too easily, slip too much, etc... well, I get the motor on Saturday, see what I'm dealing with at that time and check the Princess Auto (Canadian version of Harbour Freight) and see what they have for arbors. They have some good prices for the various 8" wheels, but, none have a solid/leather centre to work on the tapered arbors. Though I saw someone online say they varnished the centre of their pads to make them more solid and work better on the tapered arbors.