A tack in the glove is fine with me...
Unless Joe Niekro was a master illusionist I can’t see him using a nail file in his back pocket. I can see him using something else on his junk pitches that made them move and cut, and that nail file happened to be in his pocket for his knuckleball pitch for his finger nails.
Freegards
A tack in the glove is fine with me...Which reminds me of Rick Honeycutt. In his pitching days, he once had a tack held to a finger on his glove hand, held there with a flesh-coloured bandage. When he got caught with it, he walked off the mound and, without thinking, wiped sweat from his forehead . . . with the tack hand, leaving a gash going across his forehead. His teammates didn't let him live it down the rest of the season . . .