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@M_V
That said, I gave the boric acid powder that @coldharbour suggested as flux for brass brazing another shot today and finally had some success with it.
Stuck this stem in a tub in the bath as I was pouring a kettle of water over the frame above it and the flux, a lot of which was very hard and glassy, came right off.
Cheers for the recommendation and advice about this @coldharbour.
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