Hammer Time!

[B. Dudley]

What happened to your hammers?

[Pa SxS]

Just guessing but if the second set of pictures are the replacement hammers, it looks like the first set of hammers were of a later design with the much compressed curve and it looks like the hammers would not strike the firing pins correctly.

[edgarspencer]

looks like the replaced hammers were from a much lower grade gun. The replacements are much more appropriate.
Chuck, I don't think there is an axle-to-firing pin difference.