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28 Bolt Feature?


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I noticed that all of the 28 bolts I have seen have a hole about .1 dia. on top of the bolt "nose" about 5/16 from the end of the bolt.

 

Does this hole have a purpose?

 

Was it needed only for alignment during manufacturing?

 

Has anyone observed a bolt without this hole?

 

Thanks,

"Shooter"

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