To make a set of blocks, start by cutting a 2-1/2"-wide blank from 3/4"-thick stock where shown below. Make the blank as long as you wish, working in multiples of 4-1/8" (final trim size of 4"). Next, lay out and drill a series of 1" holes through the blank, centered on its width, where dimensioned on the drawing. Now rip and crosscut the blank as dimensioned.
Cut a pair of 1/2" bevels on each block using a bandsaw. For now, set aside the pairs you plan to use as alignment blocks. Complete the clamping blocks by adding 1/4" hardboard outriggers.
Add a couple of coats of clear finish to all the blocks to prevent glue from sticking to them. Finally, apply 3/4" self-adhesive cork pads (available in hardware stores) to the edges of the clamping blocks to prevent workpiece-marring.
-- from the WOOD® magazine shop
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