The tommy bar shouldn't be nipping anything to do with the wheel, it is only holding the wheel in the forks. the hollow spindle and nuts set everything to do with the wheel, bearings, brakeplates and shims.
And half is re-written when you come to alloy racing plates with no nutsAnd a dial gauge too !!, My God , You will be doing Cams next .
I had forgot how many things you have to know about a Front Wheel,
After 55 years of playing, And a few Bangs on the Head, I am surprized I remember anything !.
Danno,
The larger micrometer is for the accurate measurement of items ranging from 1 to 2 inch diameter
Peter B