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And the G&P gears blowing up is caused by either the CNC program or the cutting tool on the lathe that made it.
On the shaft of the sector gear there should be a smooth transition to the shaft. There is not.
When the tool cut the radius it "stopped" in the tranistion and essentially made a "line" in the radius.
This is a stress riser.
Classic mistake on any radius and QC can catch this by using an exacto knife to scrape the radius to detect a clicking sound.
No clicking sound. She is smooth.
But this is mass produced.
That is why of you have a gear with a seperate axle it does not snap off.
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