Glass is cut, two 1 3/4ish inch holes. I cut the holes with my 1 1/4 hole saw then used the diamond bit on the rotary tool to enlarge it. Things went well until the clean up when I dropped my drill press on my toe. Usually it wouldn't be a big deal as I wear heavy shoes when working outside with power tools but we are having a birthday party and I didn't want to track all the crap through the house and the nice clean carpets so I took my shoes off at the door.
Anyway, the overflow is all glued up and will be glued to the aquarium tomorrow. When working with bulkheads it's nice to know the holes don't have to be perfectly round.
Doug
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