Spark Gap Question

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Original poster: Tom Wideman <twidem01-at-baker.edu> 

Hey! Noob here again. I was just wondering about spark gaps
and what types of materials you can use to make them. What
do some of you favor? Copper plumbing tubes? Ball bearings?
Screws?

That is number 1.

#2

Then as I was thinking of how, when I made my first coil, I
would gap the spark gap the right space.  Then I thought of
a spark plug gapper! WOW! But as I was thinking i thought
maybe I could use a spark plug for my spark gap!  Does
anyone know if I CAN use a spark plug?

Nano2e