Actually, silver solder to a plumber is brazing rod. Plumbers, at least the one I used to work for, still call lead free solder just plain solder or soft solder. Stay Brite is a harder version of regular solder that is also corrosion resistant. For those who don't have experience with this stuff, you'll be surprised just how strong a properly made joint is with just plain old soft solder. The strength comes from a proper mechanical fit of the two parts then using the solder as a glue to hold them together. I can't imagine any application where a solder on clevis on a properly sized rod could come loose assuming the joint is completely full of solder like it's supposed to be.