Brake drum details '400' requested

[Marcus]

My'400' is a 1949 model year, second series. On all four brake drums there are two small drilled holes to accept the drum fixing screw to the hub. This screw is a 1/4" BSF CSK Machine Screw 1/2" long.

I need to know the 'straight line' distance between this hole and the nearest wheel nut stud - hole centre to stud centre. All four of mine are circa 24mms. Are there variations on this distance depending on year of manufacture?

I have very good reasons for asking such a strange question and the aftermath may form the basis of a longish follow up post.

If any member has a '400' or perhaps '401' on blocks with the wheels removed and can just quickly run a straight edge edge across to give me the detail in mms I would be most grateful.

Thankyou.