A couple of weeks ago I drilled a hole in a mates tank for him while it was full.I bought a few diamond hole saws of fleabay in different sizes from 20-50mm for about $20.Ive done a few tanks now it does take a bit of practice but can be done quite easily.I have a pressurrised water bottle that i get someone to use while im drilling,it only takes a squirt every few seconds to keep the cutter workingI use a cordless drill.I dont use a template,just simply start on a corner of the cutting surface of the drill and feed the cutter in.But a template would make it easier.But if the glass is tempered thats a different story.And once you get the hang of it you dont have to go that slow,its all about pressure not speed.You get the "feel" of what the cutter is doing and how much pressure you need.But if your hesitant get an overflow box.
Cheers Mat.
Cheers Mat.
