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Discussion Starter #1
Looks like someone spill something over the bolt in the factory. Is this normal? If it's by design, what's the point?

 

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Discussion Starter #3
Why to that particular spot? Harden the link to the carrier?
 

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what you're thinking is the hardened area is actually the softer area (in the middle). The nose and the main body are high stress (impact) and wear areas.

-SS
 

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Discussion Starter #5
I would have thought that the areas with the machining marks are the ones left untreated. In any case, thanks for answering my original question.
 
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