I made the mistake of trying it out right before I was to head to work at a salon. Brand new out of the package. tip of right side of left index finger. AND it was "perm and color" day. Got the super glue took it to work and had one of the other gals help me put it on. You can call it the "CYF" or the "RCC" (rotary cut club). Everyone knows it usually involves an index finger. Although I know of one who cut her pinky. She came "around the bend" as she called it. Didn't feel like turning and just use a short cut. Pinky of left hand was sticking out just right. Rotary cut toward herself like a big "U". Nipped the pinky with part of the nail. OUCH!!!