help drilling glass

I've never tried it before but I believe you're supposed to use a diamond tipped hole saw and an external guide, as opposed to a pilot bit.

took mine to the local glass shop did it for me for FREE!!! only takes them 5 mins just tell them what size mark out where and they will do it for you

At the end of the video he drills his tank. No pilots needed, unless you need them spaced out exactly.

This guy has alot of great vids.

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http://www.youtube.com/user/LimpitsReef