12-02-2012, 07:42 PM
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9 times out of 10, you can't keep your iron because you are gripping somewhere along your leg, rather than staying centered through your seat and allowing your leg to simply 'hang'.
If you grip your knee or thigh, you're going to take weight out of your feet, making the stirrup bounce off.
Any time I have lost a stirrup, it has been because I've had some tension creep in, gripped my knee slightly, and bob's your uncle - stirrup came off.
Too long stirrups will also do this to you, though it is more often a tension problem if it's happening regularly.