Horizon Fitness SMT6.1P Treadmill Horizon Fitness Updated September 15, 2021 19:48 For the 2005 Horizon Fitness SMT6.1P Owner's Guide, please click here. For the 2005 Horizon Fitness SMT6.1P Exploded Diagram, please click here. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles Horizon Fitness CST3 Treadmill Horizon Fitness T25 Treadmill How to Replace the Running Belt and Deck on a Treadmill. Comments 0 comments Please sign in to leave a comment.