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You're just overthinking this. We want something that provides easy access, and is easy to measure from. Just drilling holes in a regular hub cover is neither of those (and borderline "impossible to use"). Being able to measure it directly avoids indirect measurements and math, which add...
It's a lot easier to see what you're doing, and reach in there, if the whole thing is open. I suppose you could try to figure out what the minimum access you need is, but it seems like a rather pointless project. All you're trying to do is hold the spider in place, while you take measurements...