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Simple effective gapping tool - Andrew MA
Recommended by Reviewer: Yes
Pros: Small, simple to use, with right mass to tap a too-large gap into compliance.
Cons: A hole in the handle would allow it to be hung up. That's all
Having seen a person use one in a teaching video about gapping small lawnmower and snow-blower spark plugs, I sought out what he was using this is it. Has a simple to use scale. One slides the plug gap along the slender, gradually thickening, side of scale. When the plug gap meets resistance, that's the gap, which you read from the ruler-like scale. If the gap is slightly too big for your application, the tool has the perfect weight to give the plug arm a tap, recheck, re-tap, until the gap is correct. Worked in seconds for me.