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Now for the vent hole
I was really scratching my head on this one, remembering what a pain it was using the 2 inch drill bit I bought for the battery box. It worked OK for that application, but only because I had board behind the metal to support the drilling on the drill press. Not so here. I couldn't figure a way to put a board behind the firewall, much less trying to hand drill the hole with a monster bit in an electric drill. So I decided to go with my unibit, making connecting holes all around the edges of the hole. Then I used my Dremmel with a sanding drum to clean up the excess. I went through about 4 sanding drums in the process.
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