First use of this tool. It worked great. Simply insert the spark plug into the rim and twist until it stops slipping. this is your gap Too big, crush on a hard surface. Too small, use the hole in the tool to open it wider. The tool is just over a quarter solid metal and feels solid - you can't break or damage it, so it'll last forever. Adjustments (e.g. so small that you can't tell if you moved it) - the tool will tell you if you hit the correct gap or not.
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