When building cabinets, I found an easy way to guarantee parallel sides that sit square to the bottom. The simple solution utilizes a pair of fence clamps and a wood spacer during cabinet assembly.
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Drawing of custom clamping
Drawing of custom clamping spacer

When building cabinets, I found an easy way to guarantee parallel sides that sit square to the bottom. The simple solution utilizes a pair of fence clamps and a wood spacer during cabinet assembly. 

First, cut a spacer to length that equals the inside width of the cabinet. Drill a 3⁄8" hole in the edge of the spacer near each end to fit the rod of the fence clamp.

During glue-up, clamp the spacer between the sides at the open end of the cabinet. The fence clamps make it easy to clamp one end at a time. This clamp assembly holds the sides in the correct position while the glue dries.

—Steve Pietrowicz, Cresco, Penn.

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