I ordered the Origin 8 38-tooth chainring from Rivendell, but fortunately they sent the Silver 38-tooth chainring instead, Looks great. I also waxed the chain and installed the Phil Wood BB and purple chainring bolts. Now I can ride in the 38x16 instead of the 35x19.
I also found my NOS Regina Oro 5 speed freewheel and chain, chain stay cable stop, and I have one of these (below) around somewhere - adapts a single shifter braze-on to two shifter mounts - it was a thing back in the French bike days of the 60s-70s. It fits around the around the shifter braze-on on one side. It has been converted to use a modern shifter (paddythepeddler on ebay), but I am going to keep the Roaduno as a single speed for now. Maybe I should just buy another bare frame.......
Laing Conley
Delray Beach FL