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I believe there is basically a gap between the edge of the tube and where the tube sits in the plug hole, but it's been over 2 years since i did this (i was replacing my tubes since I had some good leaks coming from the spark plug holes).
I was skeptical too when they showed me the crude tool they had fashioned. So I very carefully used my homemade tool and didn't use too much force. when you drag the washer you can feel it catching on the edge of the tube. You shouldn't be able to hit the spark plug hold threads because the washer would be too big. of course, be careful not to let the nut or washer fall off into the engine. I'm sure others with more mechanical experience than I will chime in!
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