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Step 5Drill the amplifier holes
The amplifier board has a row of connectors and switches on one side. It also comes with a pair of angle brackets that allow it to be mounted with two 8-32 screws. you can download a PDF file with a drawing of the panel hole positions and sizes at http://www.cathodecorner.com/bikeboombox/cdamp/CDAMPC-art.pdf. Print it out, cut out the rectangle and tape it to the tube to use as a drill guide.
Center punch the hole centers onto the tube.
Drill all the holes out to 11/64" first, which is the size of the 8-32 mounting holes at the ends of the row of holes. Then enlarge them all except the two end holes to 1/4", then drill the bigger holes out to 23/64" or 3/8", then the three biggest holes to 13/32".
Countersink the two end holes to fit an 8-32 flathead screw.
File out the double hole with a small file to permit a USB plug to fit through it.
Check that the amplifier board fits in the holes.
Center punch the hole centers onto the tube.
Drill all the holes out to 11/64" first, which is the size of the 8-32 mounting holes at the ends of the row of holes. Then enlarge them all except the two end holes to 1/4", then drill the bigger holes out to 23/64" or 3/8", then the three biggest holes to 13/32".
Countersink the two end holes to fit an 8-32 flathead screw.
File out the double hole with a small file to permit a USB plug to fit through it.
Check that the amplifier board fits in the holes.
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