Easy to use and seems to provide good lubrication for the treadmill. Just loosen the belt (count the turns on the adjuster screws), lube the applicator pad, slip it under the belt and slide it forward and backward along the desk. Re-tighten the belt (same number of turns as you used to loosen) and you’re done
https://www.amazon.com/Lube-N-Walk-Deluxe-Treadmill-Maintenance-Kit/dp/B07NDF2MHR

