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Bob: I do not own a micrometer or calipers. I was thinking the same way you were about just replacing the shaft, but (at least on mine) the coils were attached to the shaft as firmly as if the coil forms were cast into the ceramic (they do not nor can slide along or move independently of the shaft in any way)....I felt there was no nondestructive way to get everything off the shaft so I abandoned that approach before I could do any damage.
The ceramic shaft has 2 groves 180 degrees apart running it's length.
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