THANKS to Steve, Frank and Richard. That was exactly what I was looking for.
Do you know of anyone selling the cork gaskets shown in the drawing or the brushes?
Also on the MARC web site there is instructions to make your own brushes for about $3. I have done this for years as the Powerhouse brushes are generally not easy to find and when you do they are generally expensive.
Just click the link in my previous post, then go to Technical/Electrical and look at the bottom of the Electrical page.