Ok, it's not called hat by anyone else, apparently it's called an upset. I don't have a proper molding bench, so as the cope fills up, sand spills everywhere, add an extra frame, and I can fill the cope and ram it down with a lot less mess.
You can see the over-centre latches that hold the cope and drag together, a lot easier than trying to balance weights on the sand to stop the hydrostatic pressure lifting the cope.
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