Carl Heald Trike rear suspension info request

I think I'm going to modify the rear suspension of my TS-130 to be similiar to the Carl Heald Super Trike. I think the swing arm suspension is more compact than say the dune buggy style rear suspensions. Anybody have info on these or some good pics. I take it the frame attachment tube where the front attached to the rear frame had brass bushings where the bolt went through or did they use bearings?