Choke pull off and Fast Idle? Related?

Hi

I have read the "choke-adjust" page here and also the Holley 1920 Manual here but still dont quiet understand how they work.

Correct me if im wrong. When i first turn the ignition key to start the engine, the vacuum created in the carb body pulls the choke pull off out. Correct?

What does this do? opens choke butterfly a little? and also pulls the fast idle cam up and set the fast idle screw on one of the fast idle cam steps? then what?

As the engine warms up, the choke pull off slowly releases and the idle speed goes down? But the fast idle cam is "seated" on one of the cam steps how can the speed go down?

Sorry if im confusing you more, im just trying to understand how this thing works as mine is NOT working! (or most probably not adjusted properly).

As you can see from this picture below, the "U" choke pull off link is way too "wide"... will be adjusting that this weekend hence need your help.



PS: Yes Dan I know I should have bought the brand NEW carb of you... wink ;)

Thanks

Syed