I bought an Auto twirler at the end of last year. I finally put a car on it this last week. Apparently the company was sold and has had some quality control issues. There is a large bolt that goes through the main upright with a large thick washer to hold it in place safely. On mine the holes were drilled on an angle instead of straight through so the washer wouldn't fit in the hole. I had to plasma cut out over a quarter inch of each hole to make it work. My other problem is I put a 70 Challenger convertible on it and can't get it perfectly balanced no matter where I adjust it. I was told the lower center of gravity of a vert makes it tough. The steel and welds do look like it is made very well but so far I'm really not completely satisfied although it will work for me just not as well as I hoped. We'll see how it goes with the next car on it.