To assure a good pan to frizzen fit the frizzen must be drilled for the screw while it is clamped tightly to the pan and plate. Then, after drilling, it will need to be hardened and tempered. If you have never done this before, the chances of success are fairly low. It would definitely be better to send the lock back to us to have that work done. In all probability, you don't need to actually replace the frizzen unless you have fired several thousand shots with it. Sanding or grinding the face smooth is likely all it needs.
As for the broken spring, we will replace that under warranty if you return the broken one to us.