When hitting a putt the right arm bends because it IS the power. The right arm will bend and fan and then PUSH (thrust) until it is straight. That is hitting a putt. So yes, the right arm definitely bends.
When swinging a putt the right arm doesn not bend. The putter is moved by the pivot and because the left wrist does not need to cock the right arm will not bend. Here the power is the body.
Very different.
As far as how much the putter moves up and down. When hitting a putt low point is the left shoulder. When swinging a putt the low point is your spine. So the putter will move back, up, and in---down, out, and forward on both strokes but around a different center.
Very different.
So....if you wish to hit your right arm will bend and fan a bit on the way back and then your right arm will straighten after it passes your left shoulder. You should monitor your shoulders and keep them as quiet as possible. You should also monitor ball position and have it more up in the stance, just shy of your low point (left shoulder).
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