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.
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