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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.
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).
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.