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Please Let Me Know How Much You Like This (1 is very Bad - 10 is Excellent)

Gear rack drive for reversing rotation 1

Green runway is kept immobile by its pin and a slot on the base. Input: pink (or blue) gear.

Output: the other gear. It turns at the same input velocity but in opposite direction.

Disadvantage: turnable angle can not be large subject to rack length.

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