I have no idea how owners of early 28 gauges approached the rim cutting problem. I was lucky in that, as a teenager, I was employed in a very well equipped instrument shop and I set up the rim cut on a Bridgeport vertical mill with the help of my talented employer. When I obtained #97032 a few year ago, it was easier. I borrowed a 28 gauge Manson rim cutter from one of our members.
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