Two problems I encountered on first use: 1. The two largest bearings overlap the sides of the cutters when installed. You don't sit away from the tailors. When the end screw is tightened, the bearing presses against the side of the blades and locks the bearing in place, giving off small sparks as you cut. Um, wow.2. The end cap screw threads do not match well, and the socket head in the end cap screw does not match well either.