I think I originally started this thread. I soldered and used a bike chain. Within about a week the bike chain was gone and someone tried to unscrew the soldered bolts. The solder worked. I still have my seat. I'm not going to reattach the bike chain. Too many would-be theives carry around chain breakers, I guess. I did buy a thin cable to lock it as additional protection to a the U Lock. I also bought a crappy looking cover for the seat.