Oh crap! Wire feeler gauge? I put a 20 and a 16 together and jam them in there...
They didn't mention anything about gapping sensitivity. I just went ahead and went between my normal 40 and there are 32 and did a 36...
Are they a standard plug or an iridium. I spent the extra buck for the iridium plug and he made me aware of this.
I also when with the peanut plug(5/8)