My flintlock has been getting more and more unreliable of late, turns out the case hardening on the frizzen had worn so the sparks weren't particularly sparky. I've sorted that now, but in the course of fiddling with it I've discovered that the sparks are often missing the pan! They land too far forward and end up under the tail of he frizzen! Any ideas what can be done to remedy this?

It's a Navy Arms Harpers ferry 1803.

TIA, Jamie