A member of ATHS, Gene Buchanan, in Wisconsin had some sort of unusual tandem setup from an old Chevy truck. It was interesting but confusing, looked like a lot of trouble to me, but I don't remember the exact setup, probably did have the two pinions pointing to the center of the tandem setup.
I was there to pick up some other stuff, and he gave me a tour around his place. I don't know the whole story, but it sounds like he sold it but it was never picked up. It might be worth a try to call him. I don't have his number handy, but you can find him through the ATHS, he is, or has been, very involved.
www.ATHS.orgGrigg
