McLane Research Laboratories Mark 78H-21, User Manual

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6. Remove the seven (7) bolts (without the plastic washers) that secure the gear plate
assembly to the top fixed plate and gently remove the gear plate assembly. The
gear plate assembly will be visible on the underside of the top fixed plate. The
Variseals® will be visible on the underside of the gear plate assembly once it is
removed from the top fixed plate.
The four retaining bolts (with plastic inserts) keep the bottom fixed plate in
place and hold the plastic ball bearings. Keep these bolts attached or the ball
bearings will fall out.