Joe Niekro was also on that Astros team. His and brother Phil's screw ball were legend. You couldn't appreciate the screw ball up in the skyboxes but was a blast to see from behind home plate.
The Niekro bros were famous for knuckleballs, they can have corkscrew action. Joe Niekro was caught with a file in his pocket, but he wasn’t cutting up the ball with it. It was for his nails in the dug out to throw the knuckleball. Not to say Joe Niekro wasn’t cutting up balls, but he wasn’t doing it with a nail file in his back pocket. Joe was much more of a junk pitcher, he could have thrown actual screwballs regularly.
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