A fast and easy way to get your Cybex treadmill in peak condition is by replacing Thumb Speed Control assembly on the keypad. It's the point of contact for gym members and can be one of the hardest working parts on cardio equipment. OEM #C7T1016, the Cybex Thumb Speed Control replacement part installs on the right side of the keypad. This part can be used on Cybex Treadmills 600 and 700 series. See also Cybex Keypad, Thumb Incline Control, Left OEM #C7T1017.