You can point/pull the butt at the ball with any setup. They use straight arm because either a) it's more natural for them and/or b) straight arm's have more leverage.
http://www.youtube.com/watch?v=y8AJYfkJ4hc
http://www.youtube.com/watch?v=K9cR_S7jakA
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Yonex VCore 100s - SW 351 6pts HL
Tour Bite / N.VY 16 @ 51lbs
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