Turntable no longer turns

Question

Our turntable is no longer turning. If we remove the glass tray the spindle will turn. But with the anything on it, it no longer turns.I have the same problem on a Emerson Microwave ( model MW 8105SS )I need a new motor and looking for a parts diagram for part number and a place to buy it. The problem is the plastic shaft that goes into the round magnet in the motor housing is worn and slips.Any help will be greatly appreciated, Thanks Robert