When I was an apprentice one of my jobs was making soldering brushes. We used horse hair (from the mane) for the bristles and galv flat folded to make a handle. Insert hair, close with a sharp tap from a hammer to capture the hair. Trim with snips or scissors.
Keep the small amount of flux you intend to use in a shallow dish so you don't lose the lot when you knock it over. We made ours from sheet lead for stability.
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Keep water close by to rinse your eyes when you rub the sweat off your brow with the brush still in your hand....
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