Step 1: Put Together All Your Loose Pieces.
Step 2: Drilling the Holes
(1) With a pointer (center punch, nail, etc.) in your drill press chuck, position the pointer over hole location " A-1" to be drilled in the block, and clamp the block down temporarily.
(2) Position the fence so the two marks at " D-1" line up and clamp the fence firmly. ( In reality, the block rests against the fence with no space as shown in the drawing).
(3) Unclamp the block and you are ready to drill all the holes in row " A". Position each cross line as shown in "D-1" and drill. If you match the lines carefully, all the holes will be spaced evenly and held in a straight line by the fence.
(4) When all the row " A" holes are drilled, move on to row " B" and move the fence so you can position hole location "B-1" under the pointer, the same as was done in step (1). Then drill all the holes in row "B".
If you chamfer the bottom edge of the fence, the block will slide along without trapping any drill dust between the fence and block. Use a brad point or Forstner bits to drill clean holes in your wooden or plastic blocks.