Quote:
Originally Posted by Myka
The biggest challenge is holding the bit in the right spot while you start it. You always have to start on a bit of an angle too, get it going a bit and slowly get it all th way around..
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Grab a little chunk of styrofoam and use your hole saw to cut through it. Then clamp it onto your tank as a template, it'll keep your bit from skipping around. I've done the angle method as well and the template makes it a lot easier.