Tire Balancer

I'm looking to modify a racing kart wheel balancer left over from my son's racing days. The unit is very accurate, and nearly friction free. I am looking for someone or a source to make me two centering cones. Any ideas?

http://www.marcparnes.com/Motorcycle_Wheel_Balancer_Components.htm

No connection, just a happy customer.

I have sent them an email for information. Thanks for the info.