Re: metal identification guide?
Yes, I think you are right. It does sound like Pot Metal (Zinc Die Cast).
One way to test is to take a drop of battery acid and place it on the part. If it fizzes vigorously, it's Pot Metal.
Try a less abrasive compound to remove the black finish, like a brown tripoli compound. Pot Metal is very soft.
You can easily zinc plate pot metal, then apply an Olive Drab Chromate.
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