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Now for the fun part
I decided, after looking at Mike Schippers RV-9A website, that I needed to establish the first hole. So I drilled the upper right hole first. I used my unibit, which worked quite well. After I couldn't go any farther in with the unibit, I switched to a regular 3/8 inch bit to finish off the hole. Next, I decided to establish the hole on the other side. After putting a bolt through the right side of the firewall, I stuck a fine point sharpie inside the tube hole on the left side of the motor mount, allowing the point of the sharpie to stick out enough to touch the face of the firewall. Then all I had to do was move the motor mount up and down against the firewall, using the right bolt in the motor mount as a pivet point. Then fine point sharpie made a nice line on the firewall, somewhat intersecting the predrilled hole in the firewall, showing me where to drill. Oddly enough, a fine point sharpie pen body is exactly 3/8 of an inch in diameter, which makes a nice snug fit inside the motor mount tube hole. I pulled off the motor mount and drilled the upper left hole in the firewall, just as before. Then I temporary bolted the motor mount back onto the firewall and drilled all of the other holes with a regular 3/8 inch drill bit. Piece of cake!
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