Step 1: Mark the Blocks

Use a ruler or measuring tape to find the exact center of the width of two 6-1/2" x 4" x 2" wood blocks. Mark the center of each with a pencil.

Step 2: Drill the Blocks

Use a Forstner bit to drill a hole into the center mark of one of the blocks (Image 1).

Using a 3/8" bit, drill a hole into the center mark of the second block (Image 2).

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    Image 1

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    Image 2

Step 3: Create a Bridge

Use the machine-threaded 3/8" hex-head bolt as a bridge between the two blocks. Affix the bolt's washer to the 3/8" hole and its retaining collar to the Forstner hole.

Step 4: Secure the Blocks

Using C-clamps, tightly secure the blocks to the center of the surface you want to pull apart (Image 1).

Use an open-ended wrench to loosen the bolt, which will push apart the seam or joint underneath the two blocks (Image 2).

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    Image 1

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    Image 2