Using a Drill Press, wood, & clamps to align the drill bit with the desired location of the hole in the Bow Panel. In the second picture if you look at the aluminum cutting curl specifically, when drilling aluminum you apply pressure to the drill bit tip till you see a clean curl like that.
I de-burred the holes once drilled on both sides so the switch & retaining ring / boot sit flush on the aluminum.
So the reason I am installing the switches in the lower left hand corner of the panel is because I use a launching rope secured to the bow cleats. When the switches are higher on the deck the ropes when launching the bow catches on the rubber boots breaking the Batons out of the switches. This is the least likely place for a switch baton to get snagged.


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