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This link is a tutorial guides you how to use the button mold to make buttons, also it is a link to buy nuts.
----BUT, WE WON'T SELL IT IF YOU DON'T BUY THE MOLD, WISH YOU CAN UNDERSTAND----
50 pcs/lot, 1 pcs=1 nut (copper)+1 screw (iron)+1 shim(iron), the price is 10$, if you buy the button mold, we advice you buy some nuts.
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