It is part number 402-520. It is a single piece that looks like it is made from 2 pieces. There is a little twist/play right where the gear touches the bell. I think it is not supposed to have any play in it. I think that happened when my clutch was too tight and I held the head when the motor revved to keep the blades from spinning.

Thank you for your reply and I hope we can get this figured out. If no one knows, I think I will locktite it and give it a try.

Take care......jster