Zinc didn't used to be that big of a problem when getting WW at the tire shop those were the good old days. What was even better they gave them away and I never paid a dime for them they were just glad to get them out of the way.
Nowadays Zinc and Steel weights seem to be over 50% of the haul but you can sort them out before melting them down and sell the non usable weights for scrap. Scrap yards around here don't care if the WW have zinc in them or not they just buy them by the lb. and you can also sell the still clips as well those get you about 7 cents a lb. as dirty steel around here.
So if you buy the WW use what you can and sell the other stuff for scrap. I generally turn around and take what I make off the scrap and buy sheet lead which i get for 50 cents a lb. last time I bought a 50 lb. roll.
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