Thanks guys for the pointers.
Rocklock and OhioJoe: Not getting consistent sparks. I'm using Tom Fuller flints. I have been using them upside down (flat-side up), to get the strike up near the top.
On the first one, I didn't have it perfectly square to the frizzen, so it took a corner off. I may be able to re-knap it later. The next one worked better, but still only get enough sparks to light the powder maybe once every 2-3 hits. I'm using Olde Oxford 2F (real stuff) for both the load and the prime. When the pan lights, it fires every time. At half-cock, the flint is resting on the frizzen (it won't close completely), even though the flint is up against the clamp screw. I'm using a thin piece of suede leather to hold the flint so that I can get it back in the jaw as far as possible. It seems to be solidly held, without any movement.
I'm beginning to think that the cock isn't positioned on the shaft correctly, because it doesn't seem to make sense that nothing fits quite right.
Hylander: Yes, it's from a kit.
Oh yeah, I'm near Everett, WA.
Bill