That got me looking. All the drawings have a mixture of fractional inches and decimal inches. Maybe I'm wrong but back then, working to 1/64" would be pretty accurate blacksmithying, let alone to .001" Whether the dimensions could be achieved, or were necessary with a thou (or less) accuracy, on a fabricated steel tubed brazed frame is questionable anyway on such a mass produced component.
Even Julian's Service Sheet has the same mix of fractions and decimal inches, maybe the result of revisions by different drawing office cultures, or a lax attitude of those in charge at the time. All fractions or all decimals makes more sense, especially in a service and repair environment.
Confirming dimensions from other published sources would be a good way forward. I would not be inclined to trust entirely the original drawings that started this post.
Swarfy.