84 Fj 1100 progressive dampening rear shock Question.

[Lloyd Van Duzen]

I'm wondering how this adjustable shock works.  It has remote adjuster small sprocket turning a larger sprocket on top of the rear shock.  Does the larger sprocket compress and decompress the shock spring?  And has a screw speedo cable like thing that turns as well.  This is for dampening and response I think.  Can someone direct me to figuring this out.  I took mine out to clean up and free the rusted little chain too.  Seems pretty hard to turn the big sprocket with the remote turn dial. Thanks for your help.

[mike g]

chain does the preload
cable does rebound damping
higher numbers mean harder
i'm running max on my 3cv