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When adjusted, the position of the right and left Eccentric
Spacer should mirror each other.
The Bearing should be snug against the rail. Use your
finger to roll the bearing. It should not spin in place.
When the bearing is properly adjusted against the rail the
entire Carriage Assembly should move as you roll the
bearing. Make sure the Carriage rides smoothly along the
full length of the rails. Adjust as required.