Cause / 109

1. Lift out of plumb. 2. Unlevel floor. 3. Worn arm pins. 4. Worn arm or carriage holes. 5. Worn carriage slide blocks. 6. Bent arm. (Overloaded).

Repair / 109

1. Plumb columns. 2. Replace floor or shim columns. 3. Replace arm pins. 4. Replace parts. 5. Repalce slide blocks. 6. Rreplace arm. Also check damage to carriage.