Quote:

I am assuming that the adjustable cans adjust the amount of advance, and not how much vacuum it takes to get full advance.



Just the opposite. The adjustment adds tension to the spring inside changing starting advance vacuum and delaying full advance. To adjust full advance a shim has to be placed between the arm and the stop(backside of the can)
Ron


In sixty-five I was seventeen and running up one-o-one I don't know where I'm running now, I'm just running on Jackson Browne-Running On Empty