Model 649-2 plugged hole identification

[T2star]

Can anyone tell me what the plugged hole beneath the cylinder release on this model 649-2 is for? It's not present on my own 649-2, or other images I've seen.

Imgur: The magic of the Internet

 

[zipty6]

I believe that's the base of the hammer stud. Yours has one too, it's probably just less visible.

 

[Old_Cop]

Hammer pivot pin I think.

 

[T2star]

Thank you for the quick responses gents!

 

[dubshooter]

I have a 36 that the hammer pin was broken and replaced. Same thing

 

[T2star]

Would this suggest the piece I posted a photo of was previously repaired?