Today i was working a little fast and i didn't start the spark plug with my fingers enough, and stripped the first few threads in my head...
what is the best plan of action to fix it?
A)tap the hole (not sure what angle to put it on though)

B)plug the hole with a rag and sand the first few threads down until i get to the good ones.

C)take head off and tap from inside out (LOTS OF WORK!)

D)Keep trying, and possibly continue stripping threads.

is it extremely critical how close the end of the spark plug is inside the combustion chamber?