How does the Lumbar & Dorsal Tension Control Knob Work on a Zenith 320

     The Lumbar & Dorsal Tension Control Knob Work on a Zenith is an offset cam tension control. 

So, at the 12:00 center position the tension is even on both drops.

At the 3:00 position the tension is Max on Lumber drop and Minimum on the Dorsal Drop.

At the 9:00 position the tension is Max on Dorsal drop and Minimum on the Lumbar Drop.

    Spinning the Tension control Knob round and round does NOT Increase the tension. The tension must be changed Internally inside the drop by expanding or shortening the tension Block!

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  This type Tension control setting is the same for the Zenith 320 Table , Zenith 320L Table, Zenith 360 Vertilift Table, Zenith 420 Table, Zenith 440 Table, Zenith 440L Table, Zenith 460 Vertilift Tables.