I bought this to try and cut a perfect circle around a hole in my carpet so I can patch it. I bought it and watched several how-to videos. I installed the blades as instructed, but when I tried to cut a circle on the rug it just caught and pulled, and with each push it bent the tine in half, which should help hold the rug in place . I ended up with a very uneven uneven circle that didn't push through the carpet in all parts of the circle. That pretty much defeated the objective and I got it back.