I posted a few weeks back that after about 15,000 miles the master link came off the chain on my Shadow while on a country road. I replaced the whole chain and put on a new master link of course. I seem to recall someone said I should definitely peen over the rivet holding the link, and wondered just how to do it with the chain installed. I looked at some chain breaking tools, but doubt they'd be man enough to actually quash a rivet much at all. For now I've safety wired the link, first time in over 30 years of ownership, but I don't need to lose another link next season.