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Up here, those Zn clip-ons are really rare. I see more of the square stick-on Zn than I do them. But Fe weights in both forms seem to be getting more and more popular, likely due to more new cars having them. Most garages here still replace them with lead when it's winter tire change time, which is a good thing.
I don't bother sorting much before doing a big melt. But I keep my temperature low by always including a few lead stick-ons. If they refuse to melt, then my temperature is safe.
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