How Do I Replace a Lost or Damaged Safety Key? Horizon Fitness Updated April 21, 2022 21:11 To purchase a replacement safety key, please visit our parts website. For video instructions, please see: 7.0AT Replacing the Safety Key Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles How Do I Find Lubricant for my Treadmill? How Do I Complete Tensioning and Aligning a Treadmill Running Belt? Tensioning and Centering the Running Belt What is Covered Under the Cardio Equipment Warranty? Horizon Fitness 2020 7.4AT-02 Treadmill Comments 0 comments Please sign in to leave a comment.