It sounds like it is probably stuck in "cold" mode, which is what happens when the wax t-stat quits. You're saying that it's always tight and always in the same position regardless of whether the engine is hot or cold, right?
To disengage it, you have to pull forward on the advance lever with quite a bit of force -- more than you will expect -- in order to relieve tension on the cable so that you can free up the collar to rotate. It may seem stuck or very tight, but it *will* move. You don't need to undo anything else.
Does this make sense? I think we have tried describing this a few different ways here but it is a little difficult to visualize without looking right at it. Just to be completely clear, again, you don't need to remove anything or touch the 10mm nut on the cable end in order to disconnect the CS device -- just loosen the cheesehead screw and collapse the end.
If it's tight, and you're running cold advance all the time, then you should also have a fast idle at the same speed you had before all this work was done -- unless someone moved the ball stud on the top of the advance lever that blips the throttle lever up. Look close at the interface between the two levers. Does the throttle lever rest against the advance lever, or against its own stop screw on the top of the pump?
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