[William Miller]

It's not a definite click because the star is rubbing against the spring. If everthing was new or clean and lube well you would feel it, but not quite a "click". The phillips screws don't get torqued ver much, but rust doesn't help. I have a impact scredriver that you hit with a hammer. This drives the bit into the screw and twists at the same time. This way you won't strip the head of the screw. If you do/did you can then just get a drill that's a little larger than the diameter of the screw. drill into the center of the head. when you get thru the part with the head the head will pop off.
At that point you can pull off the rotor and grip the part of the screw that is sticking out with vice grips. The impact drivers are at sears for less than $20 I think. another alternative is drill the screw and try an easy out type screw extractor also sold at sears.

Once you get the rotor off you can remove the adjuster, clean and lube it.
There is a certain direction it goes in so before you remove it record if the star is on the top or bottom of the adjuster.
They are different on both sides.

You can't adjust until it's all back together.
Also see if there is any slack on the cable's first. The adjustment is with the 2 nuts that lock each other where the cable goes into the tube at the inside of the hub.
Good luck!