I've been playing around with an old .45 CVA Kentucky flintlock and I've noticed that the hammer has some "play" in it. What I mean is when it's at full-cock I can actually pull it back another 1/8". Is this normal on these or should I be looking at replacing the sear? The hammer doesn't always drop with enough force to move the frizzen forward so I was initially thinking of changing the mainspring but then noticed the slop in the hammer. Any ideas?