The hole I drilled to house a magnetic door catch was just a hair too shallow.

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The hole I drilled to house a magnetic door catch was just a hair too shallow. Rather than go through tedious trial and error—and risk drilling too deep—here's what I did.

Leaving the drill's depth setting unchanged, I seated the magnet in the hole. Next, I stacked printer paper next to the magnet until the stack was flush with the magnet. Then I slid the stack of papers underneath the door, raising it just enough to redrill the hole at a perfect depth.
—Charles Mak, Calgary, Alta.