Allan,

That $8.50 doesn't sound bad to save you the running around to find the right thickness of rubber. I just dropped by a rubber supply house here in Kansas City and found what I needed in the scrap bin. Probably not available in most areas.

As you will see in the pictures I sent you, I also made spacers for the bolt sleeves. Not sure how well it would work without supporting the sleeves from slipping side to side.

Don't forget to thin the bolt heads or they will hit the ball mount.

Paul