So IPOR is the second one and the prototype Slee is the top photo?
What twist are you thinking about, Bill? The drive line twisting the cross member? Slee's looks like a Budbuilt on steroids and IPOR's looks like it's a 1/2" thick hunk of iron.
'91 Pickup - Imelda / '08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'98 Rhygin Juke SS / '12 Gunnar Rockhound 29 / '16 REEB Dikyelous
"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein