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December 30, 2020 at 11:51 am #226399
JOSEPH BRINCAT
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    You are likely correct , Tubs. Probably a #12 screw hole and they gave him the common #10 . I keep handy my chart of old screw sizes for just this kinda’ question.
    Some of the old American Standard screw sizes that one is likely to encounter on old machinery…Note that several are dangerously (deceptively) close to modern common sizes.

    #12 = .216 inch dia.
    #14 = .242
    #16 = .268
    #18 = .295
    #20 = .321
    #22 = .347

    Joe B