As a militia member of the NJ 3rd Regiment ("Jersey Blues") I had the honor to attend the 249th Battle of Brooklyn event that commemorates the 256 Maryland Militia lives lost out of the 400 Maryland regiment militia men that held off the British assault of Long Island in August of 1776.  This was the first full scale battle of the Rev War, where some 30,000 Brit Regular and Hessian troops disembarked an estimated 300 man-of-warships off the Brooklyn coast to rout the meager 3,000 Continental militia troops. 

Beautiful weather, great folks, and lots of crowd interractions - and the food and drink were both top notch.

In the pics below, I'm the old guy in the brown frock.

Well I shot the bullseye. Couldn?t catch Nessmuk though.
Haven?t tried to save the bees.

Kevin,
That hammer looks like it has already been stretched out a bit to contact the nipple better.
Do you have a photo of the lock in place on the rifle?  That would tell the story a bit better if you did.
It looks like you have a short T/C nipple on the rifle, yes?
Sometime you have to opt for function over appearance.  So maybe the original hammer would do the job better.
Or you could just grind the end of your preferred hammer cup so it would contact the cap and be done with the project.
Do you know how the rifle shoots?  If well, then go for it.  If not, there is always eBay.
John
PS:  Was low to mid 60's today with fairly low fog as I sat on the T- Pier listening to our community band playing its August concert.  Mid 90's up there, eh?  I don't envy you a bit.  But it was pretty nice when we were there in June.  I really enjoyed our time at the RDV.

Hopefully they will come.
 The weather sucks huh !
  High 90s here till next weekend.
 Our big game seasons start Aug 30th.  It needs to cool down for some bow hunting.
 Well , good luck to ya. Shoot straight.
Kevin