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The question was ---Does spark jump a gap of 7/16" , yes or no ?-----Or are you not sure why it is important to do that test ?????
There are ways of making a homemade spark gap tester with some nails on a block of wood, but I would sooner buy a $10-15 tester that you can screw to adjust for different gaps.
That looks like what I just got, but I think I got a different brand. It should work fine.