This is the procedure I took to rebuild the balance potentmeter, I recommend that you skip on the coffee before starting this endeavor.
First remove cover and face plate from chassis this will allow access to the balance pot circuit board, there are two small screws & a retaining nut that holds this pot to the chassis.
Next you will see two aluminum retaining pins, these pins must be removed to dissemble the pot. Too remove the pins you will need to remove the splayed end that looks like a slot for a flat bladed screwdriver, I used a Dremil tool for this part to grind the splayed ends off. ( Only take off as little as possible of the pins) now try and drive the pins out of the body of the pot.
With pins out and metal backing tab removed you will see a mounting fiberglas contact pad, that is soldered to the little circuit board, this pad will have a hole in the center, this will need to be removed to access the "c" clip.
Now remove the "c" clip from the pot stem, this will give you access to the plastic rotor that the stainless steel contacts or mounted on, the contacts need to be reattached using an epoxy I used JB Weld, there will be one of these contacts on each side of the plastic rotor.
After this has been done you will reassemble the pot in the reverse order,so take your time because these parts are very {SMALL} especially the "C" clip,and contact brushes, you don't wont to loose them!!!!
Good luck, and pat yourself on the back and drink your self a beer when done because you deserve it !!!!!