madsweeney,
I looked at the photos of my lock again and think I can make out the "Made In Italy" stamp. It has been mostly removed by filing, but I can still make out the "M" and parts of the other letters.
It won't spark. At all...I have shot percussion guns most of my life but flinters are brand new to me, so any advice would be appreciated.
Before considering replacing the frizzen or the whole lock, I would try some trouble shooting [pun intended]. Based on you comment about being new to flinters, I'll start with some basic stuff, so bear with me.
First, you mentioned the frizzen looks blackened. Take some medium grit sand paper--180 or 220--and sand the face of the frizzen until you have bright metal. You can use a Drimmel with a sanding drum if you want. You want the frizzen clean, and if it had been de-carbonized, you want to sand down to hardened steel.
Next, you want to get the correct size of flint. The cut flint that was in the lock in the pictures I posted earlier is too small, particularly in its length.
The basic method is to measure the width of the frizzen and buy flints of that width. But you need to be cognizant of the length, also. The frizzen on my lock is 1" wide. Going to TOTW website, I found these flints that should be the correct size. The description says they will fit a Lott lock. The width is 1" and the length is 1-1/8".
My actual flint is 7/8" x 1-1/8", but being a little narrow isn't a problem.
Next is installing the flint in the cock jaws. You can use leather or lead sheet. The leather I used in the pictures is on the thin side. It would be better if it were a little thicker. Position the flint in the jaws where you have as small a gap between the front edge of the flint and the face of the frizzen with the cock at half cock and frizzen closed. The gap in the photo below is about an 1/8" wide, which is on the outer limits, but I couldn't set it any closer because it would smash into the edge of the pan. Not good.
Next, you want to make sure the front edge of the flint is square with the face of the frizzen as in this picture.
Now you want to open the frizzen and slowly lower the cock to make sure the inside edge of the flint does not strike the barrel and the front of the flint does not touch any part of the pan.
You mentioned you were concerned that the flint in your gun doesn't "point to the flash hole". This may or may not be a big deal. I would need to see a picture of your lock with a properly fit flint to see how far off it might be. You want the front edge of the flint pointing into the pan like the picture above. It doesn't have to be dead center, though that is desirable. The main objective is creating sparks. Secondary, you want the sparks to fall into the pan.
Now that you have the face of the frizzen cleaned down to fresh metal and a flint properly installed, test it by tripping the sear and see if it sparks.
Some locks like the bevel of the flint face up, like in the pictures above. Some locks spark better with the bevel down as in the photos below. Test the lock both ways.
Note that this particular flint has the front edge closer to the face of the frizzen at half cock and the flint is positioned to strike the frizzen higher up. Both of these conditions can improve the amount of sparks, but only testing will determine for sure.
A trade off with this flint with the bevel down is that the flint no longer points to the center of the pan. It still may work, though, because the front edge is still over the pan. Again, testing will tell.
If you don't get any sparks after dressing the face of the frizzen and testing with a good flint, then I would suspect that the frizzen isn't hardened, and you could try re-hardening it with some case harden compound. This can be tricky if you haven't done it before.
I have a friend that routinely does it to every lock when he builds a new rifle. I may see if he can demonstrate it for me while I photograph each step and then prepare a tutorial on it. He uses an oxy-acetylene torch, which not everyone has. Another friend uses a propane torch with a "one-brick forge" as described in the
Wayne Goddard's $50 Knife Shop book. It might be good to document his method, also.