The Upper Body Arms on the Star Trac CrossTrainer should have little to no lateral movement (side to side).
If a CrossTrainer has excessive lateral movement do the following.
1. Remove the Upper Body shrouds.
2. Use a 5/32 Allen (hex) wrench and a 3/8 open end wrench to tighten the pinch bolts on the upper body pivot axle. Tighten both bolts.
3. Test to ensure there is no longer excessive lateral movement.
Please Check the pdf for more details.