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The shim in the bottom yoke would only be 0.5mm thick, not 1.5mm, would it not ?
The shim itself would not be under any particularly serious stress at all.
The only problem, in theory, might be the reduced wall thickness of the top yoke after boring, which would be somewhat weakened.
This is a valid concern but the amount of material removed is very small and it is a long established procedure which has stood up over time .. at least I haven't heard of any failures.
But yes, the first time I heard about it I was sceptical about the reduced strength of the top yoke.
The shim at the bottom yoke however, will not be under any critical stress at all.
If you think about it, the shim is contained/restrained over virtually all of its surface area .. only the 0.5mm wide rings at each end are exposed. There is simply nowhere available for deformation to take place.
...is my personal view.
And I was an engineer (until Thatcher/globalisation happened).
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