Sign first - dystrophy. From your description, to show the fingers in the position you want, I find the edge-on position the easiest to understand. This has the palm from the side so the lower half is black with the upper white. In addition, the description doesn't have the hands touch so they need to have separate paths.

Sign second - your question was how to show movement forward while keeping the hand in place, sort of like a hinge.

one, the right hand was backward. the thumb is the shorter hook. To show that the hand remains in contact, use the pressure ~ mark. This holds the hand in place while it rotates forward.

Here is an example from Brazilian sign language, the sign for jello (gelatino) where the hand trembles.

Note that both hands are showed edge on so that it doesn't get confusing for the reader. The top hand touches the bottom hand, and presses on the bottom hand. There is movement but it is of the fingers (the little arrows) the combination of * and ~ ensures that the hands remain in contact and pressing.

Charles Butler
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Clear writing moves business forward.