Yup, it's that simple -- djmtsu gave an exact description of my homemade cap. I can post some pics tonight if I have time. The only caveat is to make sure the donor junk yard cap still has a good rubber seal/washer under it -- you'll need that for a good seal with your MC when you screw it down.
The cap I picked up in the yard was from a '90s vintage 626, and it fits my FC ('89T2) and my '03 Mazda Protege5, so it might fit the Miata as well.
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