@Nat - That is the same that I have. Quite flat on the hat-top, slightly greyish where most others are slightly domed and smooth/polished. Happy to see you also have good results with them.
Anybody tried to use this or the original Imhothep circuit with a lifter?
but must use ignition coil. I am looking for few ideas, got to make one by next week to win a bet!
I think that I will order the next batch from some where. 
you do weird things and you get weird results. Last time I heard a similar sound was the police pulling me over for speeding!
---- the very fine one, not the rough scourcher.
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