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Although EMT is galvanized and one needs to take care of the fumes when welding the inside dimension is 1/2". This works nicely with the basket which is designed to fit into a 1/2" diameter.
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I had the design pretty firmly in mind and so did not make any plans. The next photo shows the results, exactly as I had pictured it. While my welding still needs a lot of improving my grinding has gotten pretty good to compensate.