Hi George,
Joe showed me the tool at PUB this year. These are the pictures I took (sorry they are blurry).
He made the tool out of suitably sized exhaust pipe and made cuts on one end so he could curve them inwards, and the welded a nut in there. He also welded a suitable nut at the other end, made to fit the big bolt for attaching the trailing arm.
It basically is very similar to the tool shown in the BBB.