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Really? I find that I'm more likely to have to open the gap than close it. Especially historically when plugs were less well packaged and they would bounce on the ground electrode inside the box.
The last time I did plugs on an N55, with brand new BMW plugs bought at the dealer, 3 were spot on, 2 I had to close, and I had to open 1. None were far off, and a time-sensitive mechanic would have slapped them in and it would have been good enough. But I take great care when doing my own work, and I like to be as perfect as I can.
And yes feeler gauges are nice, and I do own some, but I find them a bit more effort to use. The key thing though, no matter what you measure with, is to be GENTLE, and not scratch, chip, bend, or break the center electrode, or the surface of the ground electrode near the gap. If you're careful, you can measure with anything.
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