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I had a couple of lengths of the right diameter galvanised unithread on hand so I used them and will tie off my reo cage to those. I bought a nylon brush and dragged my compressor out to clean the holes properly too. I have no idea if it is a little floater or something the size of the house under there. It extends more or less under the entire hole and I did not push through the bottom of it anywhere when going the full depth of a 250mm masonry bit.
Only question left in my mind is what mpa concrete to order up. I am really hoping to get it poured on Saturday so I can leave it sit for a few weeks to cure well before I go boring holes in it and loading it up. Apart from anything else I don't like leaving holes open even though I am covering it when I am not actively working in it.
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