[Max Ripple]

I'm pretty sure that these dampers work with compressed air.
There are adjuster rings at the lower end of each damper to allow the setting of "descent speed".These are tricky to get at unless you take out the left hand compartment "floor" panel,and the turntable etc.
Trial and error adjustment seems to be the method to determine best setting.
However,if the internal seals in the damper have perished,there won't be any resistance at all.
Nick