Quote:
Originally Posted by wakeX2wake
using a hole saw bit in reverse w/ nothing to guide you... the bit wanted to jump each time you made contact w/ the fiberglass b/c there was already a big hole there where the other courtesy light was so there was nothing for the auger or "guide" bit to hold to to keep the bit perfectly straight
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Depending on how much larger the new hole would be, I'd have done one of 2 things:
1. If the new hole was large enough to allow for a screw head inside the diameter of the new hole, you can screw a strip of plywood behind the old hole for the pilot bit to bite into.
2. If the new hole was just slightly larger, you could make a template (cut the hole in a scrap of smooth plywood) for the hole saw to run in and clamp/ tape/ hold it in place.