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I get that but consider when the worm is driving the spur upwards. The lower face of the worm is going to turn the bearing counter clockwise.but the upper face of the worm wants the bearing to turn clockwise. If there is enough play, the upper face won't touch and it won't matter. If there were (hypothetically) perfect engagement the cones wouldn't turn at all and would just slide on the two faces of the worm.