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Squareness comparator I finished building today. I was planning to use 1/2” steel ball bearings for the feet and face but didn’t I didn’t have any in stock. Impatience caused me to improvise! I put a slight radius on some steel rod with my radius turning tool and sanded with progressively finer grit until I got the finish I wanted, then parted off at 1/2”. Reamed holes at .499” then discovered the stock I used is slightly undersized anyways, so had to cement the ...