Drill the weep hole, remove the front bead, and try proceeding as normal. usually, you'll get water out through the weep hole pretty quickly after boiling this way. Not always, however, because some times the spacers between the barrels are soldered in heavily and you don't have one continual void. If this is the case you'll need a heat gun. Preferably one that operates in the 300-500 deg. range, then you have no worries about melting solder.
DO NOT plug the weep hole or bead hole while boiling. Leave these open to allow quick pressure changes and secretions of steam, air, crud, etc. from coming out along the rib.
Once you're done with the job, and with all holes open, use the heat gun to evaporate all internal moisture.you may need to perform this heating, allow the gun to cool, then check with heat again to make sure water is not semi-trapped between the barrel spacers and slowly migrating towards the openings. Sometimes a small bit of paper towel, twisted tightly at one end to fit, and inserted in the weep hole will help draw the water more quickly.
When you're certain the void is dry, and with the barrels still hot, put oil in all openings and apply vaseline liberally to the outside of the barrels. This will help prevent further potential for rust greatly, as you're lubricating with the pores of the metal somewhat more receptive to the lubricant while hot. Allow the barrels to cool completely, then wipe of the excess vaseline and plug the holes.
Hope this helps.
Jim
