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The pointing mechanism is fixed onto the parabola. You have to choose between four different pointing mechanisms : one pointing up for all Apollo missions or one pointing to the Earth depending on which Apollo mission you choose (Apollo 15, 16 or 17).  The optical sight orientation is also different for Apollo 15 or 16 and Apollo17, the reason being the Earth elevation over the lunar horizon (68° & 75° for Apollo 15 & 16 and 45°  for Apollo 17).  For Apollo 15 and 16 the optical sight is aligned with the pointing mechanism and for Apollo 17 it is rotated by 90°.

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