Oldelm,
No looking back here.
I did the work on the cylinder by hand with a flat file and the dial calipers at every turn. Measured at about every hour mark around the face(12,1,2,3, etc.) to make sure I got it square. Finished up with 600 grit. It did take some time, but I checked it a lot more than I needed too....maybe?
I have decided to keep the cylinder in the Uberti Carbine it works fine and alignment is great.