Adjustable Armstrong Damper Valve (Each) MGA MGB MGC+MIDGET+Z/ZB - new productFactory fitment on many classic MGs, Armstrong lever shock absorbers provide their function by cycling oil back and forth via internal porting to a bi directional relief valve. The valve which screws into the body of the damper uses springs for bump and rebound control these being specific to their application. Today owners wishing to alter the operation of their original dampers (typically for competition purposes) can either replace the valves with