If you want to do this right, it is actually quite tricky. The spindle I have is rather old and is only 113 mm long. 2mm more would be 115 mm which Phil Wood does not make. Then there's the issue of chain line, and the issue of a spacer moving the freewheel too close to the seat stay,...
It's reassembled the way it designed to be used - 42/52T X 14-24T with a good chain*. I think I'll ride it this way for a while.
* Did I really pay $80 for a Regina Oro chain? I must be misremembering the price.