the index finger is not what makes the disc launch from the hand. the index and pinch mostly "guide" and "direct" the movement of the disc through the late part of the throw. the ejection is initiated by the extension of the wrist and jump off the palm and the index/thumb pinch tugs along the rim giving an extra bit onto the throw (assuming you are full hitting it and not half hitting it). this is the out motion as mentioned in the not yet completed part 4.
the grip doesn't have to be nearly as strong as you think it does because by the time the disc is pivoting it's as good as gone. the goal isn't to hang onto it through the pivot, it is to give it extra juice INTO the pivot.
that bit of extra juice is responsible for like 50-80' of line drive power, which may seem stupid and unrealistic but it's the truth
this is what separates the 430-450' half-hitters vs. the 480-530' full hitters. a little inch-long tug of the pinch does that.
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the plate drill (now attempt #5 at part 4):
if you sit in front of a an upside-down domey disc on a table, the point on the disc closest to you being 6 o'clock and the point farthest away from you being 12 o'clock, pinch your index and thumb on the edge of the disc at 12 o'clock. your wrist should be slightly curled around the outer edge. with a circular motion give a firm tug in the clockwise direction.
that's a similar kind of feel to the "full hit" portion of the throw has that happens at the end of the hammer-in. if you tug it with acceleration and get beyond 3 o'clock you should feel the wrist extend naturally.
repeat the drill spinning disc right-side up with your index on the rim.
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SpyderPride: just make sure to credit it to disc golf review (a link would be super) and to me if possible. I don't care if you use my last name or not, but if you are going to, please spell it correctly
a credit to Blake T would be fine.
thanks for taking care of something i was too lazy to do. i can forward you higher res ones if you want to upload em. hit me with an email and i can send em as an attachment. i did the smallest version possible to avoid dgr's bandwidth being ravaged.