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Just before you heat and solder scuff the brass with a file or sand paper to break the surface. This will help the solder grab hold. If you leave it to long after scuffing it the oxygen in the air will react with the exposed material and oxidize it. That oxidized material does bond well. This is much more important with Stainless but makes the work easier for all metals.
The scuff doesnt have to be all over just a the point were the pieces come together. You dont really want to be polishing scratches out after its assembled.
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