I got some unexpected time off, thanks to Irma, and made some progress on the Opus IV. I stripped the frame, found some fun rusty bits and treated them with a wire brush and Evaporust, and built it up as a quick and dirty single speed. I used the wheelset that came with the bike as the tubs have a good bit of life left, but respaced and redished the rear for the single cog. Actually, I reused most of the components except for an FSA crank and Tektro brakes. If it's not stormy tomorrow I'll go out for a ride and test the integrity of the vintage tubular glue, but a quick toddle around the neighborhood hints that this bike will be too fast for my own good.