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^^^^indeed^^^^
In wetter parts of the world wheels rust onto discs and then you're in a pickle if the retaining screw isn't used. Hammering a wheel off a wriggling disc can knacker a caliper.
I'd drill the snapped off screw out and re-tap if necessary.
A thin thin thin smidge of copper ease on the mating surfaces between the wheel and the disc ain't a bad thing either
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