How to Replace the Air Shock on a Folding Treadmill Horizon Fitness Updated August 26, 2021 17:19 Please see the attached PDF for instructions on how to replace the shock on Horizon Foldable Treadmills. For assistance, please call 888.878.9011 or email firstname.lastname@example.org. To order replacement parts, visit parts.horizonfitness.com or email email@example.com. Replacing Air Shock on a Treadmill.pdf1 MB Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles How to Adjust the Magnetic Brake on an Elliptical T202 Treadmill Assembly Comments 0 comments Article is closed for comments.