Bede, There used to be a really good liquid soldering flux called "Green Streak'. It was an acid type and available at hardware stores all over the USA. I have bought similar types, the latest one called "Ruby Fluid" which I got at the local small mom and pop hardware store here in the wilds of Troy, TN. (Wally World and Lowes haven't got all of the little people yet) Any of these liquid acid type fluxes will do a great job. Put them into the cleaned opening before you start heating because it is impossible to do so once the metal is hot. Be liberal with the flux and don't breathe the fumes as they are irritating to nasal passages albeit only temporarily. Keep the stuff away from lathe beds and mill tables as it will rust them.. I always wash my hands with soap after handling solder jobs to "kill" the acid. Jesse the Redneck MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.