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First step with a new Lee mold: check alignment and deburr.
Second step: face the top of the mated blocks and the sprue plate with emery cloth on a piece of glass.
Third: cast with it, so you can figure out what else is wrong.
I haven't lapped one yet, but I do have a mold that would probably benefit from it.
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Don't even try it. It's even worse than the internet would lead you to believe.
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