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Did you vac test?
If bearings on way, coulda torqued a seal.
Shearing a Stihl key ain't easy.
Doc like I said I have limited experience with this model, but the hand full I have worked on (can't remember the exact number, more than a few but less than a dozen) have all had sheared keys. I am not sure why that is, maybe the flywheel is so heavy that when the saw stalls suddenly there is more inertia than the key can take?