All in all, our materials were:
Dewalt 1/2" drill
3/8" concrete bit
1/2" concrete bit
3/8" and 1/2" acrylic rod
A lot of reef epoxy
A lot of black zip-ties
Chisel
Hammer
Assorted Pliers
We started the project at:
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Our base rock with bit ready to go:
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Hole drilled for acrylic rod:
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Hole drilled through rock that was going on top of the base:
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It is very important to make sure you drill at the right angles. It's also very important not to drill too close to the edge on very porous rock, as it tends to split. I'd give the piece of rock you're about to drill the brittle test. Grip both sides with your hands and if it feels like you can split/break the rock, toss it in the trash or the sump. It's not going to make for good rock.
Zip ties saved the day, without them, we'd still have a pile of rock... Luckily, I brought an assortment of bits which included smaller cement bits. I believe the one we ended up using was 1/4" It was just big enough to get the zip-ties through.
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Coming together, although I think we ended up scrapping that overhanging piece as it didn't pass the brittle test:
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