Pretty sure Mr. Gibbs screwed up a pencil popper and tried it that way and liked it.
I got to admit I don't see a lot of difference in the flat bottom pencil compared to the round one and I've fished a lot of them. Matter of fact I have gone back to fishing the regular Gibbs style pencils since last year.
Heck I even tried this, concave belly, as you can see in the pics below which looked kind of cool but without much difference in the action either
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