Daryl,
If a frizzen is gouged too deeply, the frizzen must be re-ground so the flint will strike about 5/8" to 3/4" above the pan. If the gouged frizzen is just re-hardened it will probably slow down the flint and slow the fire. If the frizzen is still has its original contour and it's not sparking, you have cut through the surface hardening. If that is so, the frizzen is probably made of mild steel and pack hardened. It must be pack hardened again.
If the frizzen is tool steel and must be re-hardened, you must protect the foot and pivot hole from getting too hard thus brittle. For something so seemingly simple, a flint lock is incredible complicated.
Enclosed is a link to a Muzzle Blast's article about using depleted uranium to reface frizzens.
https://www.nmlra.org/news/uraniumfrizzen-bevelbros
