I was replacing some old-style doorknobs with newer ones, and I ran into a problem. The old knobs went through a hole about 1/2 in. dia., but the new knobs needed a 2-3/8-in.-dia. hole. I needed to find a way to use my hole saw without it wandering all over the place. I decided to wrap masking tape around the bit of the hole saw until it was just slightly smaller than the hole in the door. My solution worked great.
John Swope, Harrisburg, PA