Lining up protruding screwheads with the keyhole mounting slots on the back of a power strip can be a frustrating trial-and-error process. Here’s a foolproof trick that works the first time.

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Lining up protruding screwheads with the keyhole mounting slots on the back of a power strip can be a frustrating trial-and-error process. Here's a foolproof trick that works the first time: Lay a piece of paper over the back of the power strip and, using the side of a pencil lead, make a rubbing of the slots to create a template.

With your pencil, punch a hole through the template where the screws would go. Now tape the template to the mounting location and drive screws through the template holes.

—Serge Duclos, Delson, Que.