
http://imgur.com/a/cPk8vLm
Album of multiple modded Byrds
I love the symmetry of the Spydie hole, because as you open the knife, the profile of a round hole remains constant, and your thumb or finger will not get jammed or tweaked like it does in a comet hole.
What isn't shown is that I scuff up the comet hole where the JB Weld goes with a diamond file and meticulously clean with alcohol in order to promote good epoxy adhesion.
My Byrds are tight, they only fit one Sharpie. But I did need to wrap a little clear tape on the Sharpie to exactly match the round portion of the comet hole.