Dream Machine (aka ring pulley assist)

What kind of harness is used? Tumbling Belt?

Any other tips or suggestions about the making of and use of a ring pulley assist device are welcome...

http://drillsandskills.com/forum/viewtopic.php?t=1377&postdays=0&postorder=asc&start=0&sid=2e9d07af5c11c49415feae1f663660fa

thanks