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I'll say first,I have not done this,it is theoretical.If you are going to weld something up,there are two kinds of channel iron.One kind has a significant draft inside the legs.So,if a person took some 1 1/2 or 2 in channel.and chopped it to 4 to 6 in long,with a little taper on the ends,you could gang them side by side,weld flat bar to cap the ends,and have a good ingot mold.
I still like the Lyman.
Anymore,if I can buy a good product that meets my needs at a fair price,my time and trouble to make it,I'd rather make what I cannot buy.
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