Guys/Gals:

Another way of setting up the holes for the DA 50 is after you've drawn the circles on the firewall, just draw a X through them (like cross hairs). The center of the X is where you drill. Very easy.

Also there's a template that someone on RCU put up for download in the GP Patty Extra thread. If you download the file, simply print it out (by his instructions) and you have a paper template for the holes for the DA50. Or you can make your own. Get some graph paper and set the engine down on the paper. Since the graph paper has lines vertically & horizontally, it makes it very easy to line up, draw circles and then draw the X through the circles. When done cut it out. Now you have a paper template.