Rick,
I cannot help with the first item.
Speaking to the second item. The offset pot is held by a plastic cup which is affixed behind the knobs of the pot. This plastic part is not available, except by pure luck or good fortune. I had to actually make one for my Type 576 on my lathe from a block of Delrin nylon. It takes quite some time to duplicate this part, but it can be done.
Best of luck in your search.
--
Michael Lynch
Dardanelle, AR
Mlynch001