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Cast iron is brittle ... there must be something scrap immediately suitable a few old taps with more tin and zinc... I dont know the ingredients but copper and stuff mix ok I think...there will be a source of metal.. even pweter would do it the size of it pweter would do it heavy but strong I would say...I will have to make up a beaker for the mix I will source some clay and get started ..anyways I will see what is available etc.
alex
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