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Hi -from a somewhat non-technical perspective: I think the lead in the soft solder makes it impossible for hard solder to stick to anything it has touched. Perhaps someone more knowledgeable than me will explain the metallurgy of this...I'm using silver solder and easi-flow flux, and my aim is to stick with this if I can rather than use soft solder for the repair..
Ramon -As a compromise, I'm wondering if I might flux round all the joints separately so that the flux doesn't connect the offending tube end to other joints? That way - I guess - each joint would be protected by flux but the one I'm trying to build up would have more chance of not losing its silver solder to other joints/areas of the cap.Does that make sense...?