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Don't know if they used a "self-converging yoke". If they did, turning the yoke left/right or up/down (I mean pitch and yaw, not twisiting around the axis) could cause convergence problems without necessarily causing purity problems (which would occur quickly if the yoke slipped backwards or forward of the correct position). If no-one comes up with real info, take a look and see how the yoke is mounted and if it has some sort of shims to control its position.
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