Agroshield
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...They're as best as I can do, haven't a bore gauge big enough to fit....
With a bore that big, it should be no trouble to poke a dial test indicator down there and measure the taper per inch properly. Either set the compound parallel to the bed and wind it forward 1" or use a bed stop and a 1" gauge block or micrometer standard. MT7 is 0.624" per foot on diameter (same as MT4 1/2). See: https://littlemachineshop.com/reference/tapers.php