Re: weak spark
You may need to replace the frizzen. I had to send my lock back to T/C for the same issue.
Last Oct after seeing only antlered deer I went to shoot it and clean it out. After 10 tries I flipped the flint & it fired.
The frizzen was marked up alot and changing to one of the 'better' knapped flints didn't help. Since it was dad's gun from the early 80's I sent the lock back to T/C, cost me around $12.00 at the UPS store.
About 6 days later I got a new lock w/ a fresh flint and the rest fo a T/C 4 pack of flints in the box [their flints at the local store cost about as much as UPS did] and a note that they could not get a new frizzen to seal tightly on my lock so they replaced the whole lock.
Sparks real good now!
4th Generation @ Kamp.
3D - There are STILL a few deer left! You need to pry them out of the developments!