Not much to it, really. The turn signal switch / horn contacts are attached to the top end of the column, and will stay there when you pull the wheel. There should be a strong spring on the column just under the wheel, which holds a forcing cone in the upper shaft bearing. These bits need to be there. Don't remove them when you swap the wheels. Shooting a bit of lithium grease into the bearing wouldn't hurt, though. Make sure you get the wheel on the shaft straight. There is a line | showing the top of the shaft when straight.