it is nicely made by rolf themselves. the wall mount and hinged leg was our contraption though. yank on the cable and it pulls the leg up so it folds against the wall. not a clue on how to determine limits. i just crank till the spokes rip out of the rim..... j/k. i just do it by feel. i am well aware that the tool can generate a lot of force. still begs the questions of whether i am using too much or too little. the the video they blank out the digital read out, not sure what it measures, deflection or some force.