Rode Nort to vintage event. I was 20 miles up the road when I noticed the Mercedes Sprinter ahead of me (and blocking view) swerve. There was a six foot ladder in the road. Managed to get far enough over so I only had to broad jump Nort over one of the bottom legs. Nort jumps like a thoroughbred - no shakes no swerves. Bike felt good, so I kept going, then I noticed when I slowed down that the side stand was scraping on the road. Pulled off freeway into gas station. End of spring was broken off. One good Samaritan tried to get the spring re-bent, which didn't work. I found a zip tie in my toolbag, which worked for a couple of minutes, then pulled out. Another good Samatarian gave me a foot or so of baling (safety?) wire and I wired the spring to the side stand. I will check later this evening (in a motel near event) but think I am good to get home.