Thanks for all the helpful comments. Got the second one spinning, after a helluva time. Even with the upside down technique, at least one would always slip out of the race. The bbs are so damn small on the SR pedal, you have to have them all in the race and sitting absolutely square in the race and ever-so-carefully spin the spindle to draw the cone in. I used just enough grease to coat the race with a thin film to hold the bearings, then used a pressure tip to inject more in after it was together correctly. Hopefully I'll get 10k miles out of these before I have to go back in there again. Which on a vintage sunny-day only bike should be pretty much forever.