I got 2 of these. I just used one of them today doing carpets and mats. I did the mats first. Worked great. While doing the carpets, it came apart. I compared the 2 and found that the screws were different from each other. I also flubbed up and didn't put the right counterbalance on my PC. DUH! That is probably why everything went flying. Just did the rest of the work with Mr. Tuffy by hand. Still worked great. After completing the job, fixed everything and feels great again.