I've got a nice J.Blanch & Son of 29 Gracechurch Street damascus barrelled hammer 12 bore which has been nitro'd but I've posted this enquiry in here as it used to be black powder and there's probably more chance of someone who knows in this section.

The RH hammer has a tendency to perforate the cap (depending on the make of cartridge) on firing and having looked at it more closely I think this is down to the spring being noticeably stronger than on the left so I'd like to replace it with one to match. The firing pins were replaced a couple of years ago and it hasn't done much work since.

So I'm after someone reasonably local to fit a weaker hammer spring to her or failing that any recommendations as to a source for these springs. I'm quite happy to remove the LH spring in order for it to be matched.

Any advice and suggestions gratefully received.

Best wishes

Fizz