glenn-d, I ripped a 2×4 in half to create 2 1.5 inch square pieces. I inserted these pieces in the digger tubing and cut them flush with the top. Since the interior diameter of the tubing is 1.75″ square there was a little extra room so I screwed through the digger mount into the wood. Then I screwed the 28″ 2×4 to these wood pieces. I had planned on using snug fitting wood uprights, but was in a hurry to get it done. I am happy with result, auger seems very stable.
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