There is no overunity, unfortunately... This is working as usual gravitation field, which can speed up a brick, if you will slightly move it over the edge of the roof. The roller accumulates a potential energy during the period, at which you sets it in the equilibrium position. You spends energy to overcome some repulsion, or attraction forces, when you are setting the roller to this position. It's enough to move the roller forward, through the "tri gate", or backward. The free run distance will be the same.
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