MSS Automotive Height Adjustable Rear Coupler and Spring Technology

The MSS patented adjustable rear spring setup for VAG, BMW, Mercedes, Mini, Porsche and Smart Car products is here to transform the ride quality, comfort, composure and control of your existing manufacturer / OE dampers.
For more info head on over to: www.mss.company.

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What prevents the coupler from altering the ride height by itself please?