My barrel arbors are machined from 5/16" dia silver steel. Again I fabricate. Each about 5" long I turn down the small spigot 1/8" at 1/4" dia. Then the other end I turn down 1 1/2" to 1/4 dia.
Then I make some steel shoulders. (note: make them extra large so its not too fiddly to braze. They can always be turned smaller later)
A groove needs to be cut with the parting-off tool for the slip washer. It's all not too critical as the shoulder will soldered after the barrel, ratchet and endplate is mounted. Then I square off 7/8" in a 'roller filing rest' in the lathe, using a division plate giving me four quarters. (pics attached).
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