I would have to say that no engineer built/developed this thing,if one did they received their degree from the bottom of a cracker jack box. Putting this thing together was a bit of a challenge due to the placement of the bolts you need to tighten. It was very clear that the product I received had been put together once before, because the three areas that you need to screw/tighten were all scratched to hell (yep right out of box) One would think that they would of sent me a new unit (that's what I paid for) but it was clear that the unit I received was used before I got it. Once together it did the job, but required some skill to not tip the unit on turns. Save your money for something else, do not buy this unit.