I love my Pathfinder awl. Absolutely love it, I find it handier than any tool I have except for maybe a starting clamp. But I hardly every try to insert the pathfinder awl in a blocked grommet hole. I insert the awl before the grommet is blocked. For instance, I like to use a Yonex loop for the outside mains when I can. Say I stringing a racket that skips 8 H&T and the mains tie off at 6T. After running in the center 12 mains I Insert the awl in 7T and the string goes in 9T to run in the 8th main. Then I string the 7th mains in 7H to 7T where the awl is (it does not matter if the swl goes through 7T or not as long as it get past the string on the outside groove of the racket. After I insert the string in 7T and the awl I remove the awl and I'm done. Slicker than snot on a glass door knob. Another benefit is the 7th main ends up on top of the outside string and when I tie off at 6T I never have a crossover becuase my knot usually end up on top too. Then when I tie off the bottom cross coming out of 8T it's on top of the outside string and again no crossovers.
I started after work and will do some more tomorrow.
Thanks for your help!