Using perforated hardboard and a self-centering bit provides an accurate way to drill shelf-support holes while protecting the hardboard’s holes from enlarging from wear.

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Shop tip 25

Using 14 " perforated hardboard and a 14 " self-centering bit provides an accurate way to drill shelf-support holes while protecting the hardboard's holes from enlarging from wear. First, using a 38 " bit, drill holes centered over the hardboard jig's 14 " holes. (In the example below, every other hole is drilled for 2" spacing, and tape is placed over the unneeded holes to guard against drilling error.) Next, with the jig clamped in position, switch to the self-centering bit, insert the bit's 38 "-diameter retractable sleeve in a hole, and drill the 14 " hole, as shown in the photo, below. You can find the bit at Lee Valley. Call 800/871-8158, or go to www.leevalley.com.

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