Re: 100:1 Mix
Some gauges have a little notch cut in them. You put that notch on the piece that goes from the edge of the plug to the center and twist it to adjust the gap.
I use a feeler gauge that has a bunch of metal strips with each marked with the thickness. You can used more than one strip if needed to get the desired thickness. Tap on the piece that goes to the center electrode until you have the desired gap.
After you have done it once it becomes a piece of cake to gap a plug! :-)
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