I made my adapter after much thinking about it. Cut it today.
I need to cut 3 keyways...
The woodruff key in my screw is in the wrong spot and would require a long, long keyslot in the new adaptor, if I put the woodruff key closer to the powerfeed, then it avoids a long twisting moment arm, and it makes my internal key slot short on my adaptor, a plus, and it winds up in a spot where there is a lot more meat on the metal. I also have to do an external key slot , I'm thinking for a regular key for the brass geared drive.
And I don't have a 1/8 regular key, so I may resize a 1/4 " key to 1/8.. I looked at getting one around here, no one has 1/8.. so it just makes sense to modify a 1/4.
I know it's a shaky pic.
I'm going to shrink fit the bearing on the second step.
I also have to make an extension so I can put my handle on, it will thread on, and be pinned. I was going for as snug a fit as I could get, and I nailed it. It just slips on, not a bit of wiggle.