RE: soldering steel control rods
I use rosin core on 2-56 size wire and clevis'. Be sure to get some flux and coat (lightly) both surfaces that will receive the solder. Screw the two together, or slip the rod into the clevis, place the soldering iron on the clevis, and once hot, begin to touch the solder to one end of the clevis. when you observe the solder coming out the other end of the clevis, remove the heat, and allow to cool. Note...be sure to sand the rod where the solder will be applied prior to coating it with the flux. Cleanliness is important here.
Bill, AMA 4720
WACO Brotherhood #1