in this version i decided to go on price and super simplicityas less as possible moving parts and expensive parts , so i used cheap tubes with standard threads, and standard nut , as banal as hell . hook and nut that tightens everything together. i made long version with handle and short version without anything , and now i am starting to thing that to shafts on both sides if device are useless too,

thanx toArmin Yousefi Kananiand his Smith machine for testingSmith Machines