When assembling a tall, narrow face frame for a bookcase, I knew an assembly jig would help keep it square and flat.

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When assembling a tall, narrow face frame for a bookcase, I knew an assembly jig would help keep it square and flat. Looking around the shop, I found just what I needed to build such a jig: an old door and a sheet of perforated hardboard.

To make the jig, first screw the hardboard to the door. Drill pilot holes centered in the width of the hardwood cleats and screw those to the door, aligning the screws with the hardboard's perforations, as shown. To use the jig, clamp the frame parts to the cleats as you glue up the assembly.

The cleats can be moved easily for new projects, and the door can be tucked against the wall until needed again.
—Edouard Piché, Troy, Mich.