Instead of a finger, I use a soft wood piece (like pine).
Then I have impression of firing pin hit.
That way I can see if the firing pin may have the tip broken off, also.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)