Perseas, is the SnP 23mm essentially the same SnP 22mm with additional top & bottom caps over it?
You can put it that way. I don't say that is the exactly the same, because the top cap's holes with the holes of the cover ring of its size are made together and the holes of the optional set of 2 sizes rings with the top cap are made together too. There is no way to measure the start of the threading and produce just caps and rings, then mixing them as we wish. Their holes have to fit, so they are made as pairs or trio.
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