Check out the 'Throwing a Screwball' link on this page to find out about the mechanics of throwing a screwball.
Since there seems there isn't a link i will explain it for you. I used to throw it a lot. But what you do is you hold it like a four-seam fastball. What you have to do after this is you must pronate your wrist. Which means you twist you hand, wrist, and forearm counter-clock wise. This will give the ball a spin that will "chop" the air to the right of it (if its a RHP, and vis-versa if its a LHP) causing it to move that direction. But beware, it is a potentially harmful pitch, especially if done wrong! Use it sparingly! If you feel pain, then stop throwing it!
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Grasp with mainly the thumb, index and middle fingers.
Your index and middle finger help determine the direction the ball will travel. Put some body motion into the throw to force more energy to the ball.
Watch some professional softball on TV.
slowpitch: i don't know fastpitch: right handed: you drive off the mound with your right leg toward the target with the left leg out in front, you rotate your hip to the right side and move your arm in a windmill motion, and snap your wrist at your hip while turning back towards the target while staying tall. all of this should be in one motion and not choppy. fastpitch: left handed: leg and rotation of hip are opposite
It is the reverse of a curve. A screwball from a right handed pitcher will move right and from a lefty it will move left.