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Oral
I'd agree that the difference may well be coming from the measurement tool you are using. I had the same situation, admittedly on a old bevel,...
Paper
Back to Classics have exploded diagrams that may help: https://www.ducaticlassics.com/parts/175-200-and-250-nc-singles/all And as I always say...
Ooo dear... be still my beating heart...
