Grinding a Cannon Pinion

Here we see the cannon pinion on an early Elgin 18 size pocketwatch. 

These cannon pinions are solid body parts and so can't be tightened by the usual means.  A few times, I have seen this sort of thing.  A watchmaker has ground down a notch in the side of the part so it would be thin enough to squeeze down some.  

Not exactly a recommended solution... 

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