NordicTrack Ski / Skier Machines Arm Exerciser AE Tension Adjustment Knob / Dial

The Tension Adjustment knob screws down on top of the large bolt/spindle which comes through the center of the arm cord DRUM.  Below this knob is a SPRING and WASHER - BEARING - WASHER which sits on top of the arm exerciser cord drum.

We also have LEGACY Tension adjustment knobs which are not as prone to breakage or cracking.