Reply To: Reattaching brass knob to depth adjustment screw -wooden plough plane?
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It’s difficult to say without pictures.
I wouldn’t use plumbing solder if it means having a big chunk of solder under stress again and again. Its far too soft for that. If there’s a thread or small gap between the brass and steel, solder may work. I guess those wings were forced under pressure to form a friction joint? Perhaps glue (JB Weld/Araldite epoxy) some metal shims where those wings used to be?
I’d take it along to an engineering company (metal fabrication) and ask them. They can asses the strength it’ll need, they know their metals, and how to affix them. They’ll have specialist adhesives, brazing equipment, 5-tonne presses, and all the brass shims you might need.