pyro, the plug is the thing you use to make the mold. Let's use this example.
I know you want to make kart bodies and probably other things as well. NOW I AM NOT SUGGESTING THIS, and if fact I discourage it, but many people will buy a part and use that as a plug to make a mold from then produce parts from that mold. It is unethical and in my opinion dishonest...but it happens. So the plug is the part used to make the mold so that parts can be made in the mold!
Mike
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