It occurred to me that I could use some pieces of scrap aluminum to make face plates for various uses.
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One is about 3" diameter and the others are about 4".
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The 3" has a 1/4" threaded hole and one of the 4" has no mounting holes yet.
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I used a metal turning lathe to make the disks. Once the disk was screwed to the adapter, the assembly was mounted on a piece of 5/8" shaft and reinstalled in the metal lathe 3 jaw chuck for final trueing up and sizing.