Build a Bike Boom Box

Step 6 Drill the speaker holes

The speaker holes may be drilled in the tube after the cement has thoroughly dried on the arcs. Each speaker has six screw holes spaced equally around the edge. We use all of them for a stable mounting job. The speakers come with long stainless steel screws that require pilot holes to be drilled in the tube. A 7/64" bit is about right.

Set the tube up on end and place a speaker in one end. Rotate the speaker so that two mounting holes are centered on each reinforcement arc. Center the speaker on the tube and mark the holes with a Sharpie.

Remove the speaker from the tube and start each hole with the drill. Place the speaker back on the tube to double-check the hole positions and correct if necessary. Remove the speaker again and drill the six holes about one inch deep.

Turn the tube over and repeat the above procedure for the other end, being careful to align the holes at one end with those at the other end so that the speakers aren't rotated relative to each other (that would look bad).