[Walt Fricke]

I was wondering how something might have hit it. It is pretty well protected by the carrier, though, if that stayed on the while.

Does it climb smoothly up to the 1mm mark, then back down 1mm at 180 degrees? Like it isn't flush on the end of the crank?

Or is the raised (or lowered) part only over, say, 90 degrees? As from being dinged?

Same whether the gauge is on the outer rim, or the inner?

Looks like feeler gauges could be used against the fan housing as a secondary way of checking?