How does the timing advance with the counterweights? I know to set the initial timing with a rule coming off the tang on the drive of the distributor but when you tighten down the bolt how does the timing advance? Am I missing something somewhere? With the bolt loose the plate is free to move and as the RPM's increase I can see how the plate would rotate to advance the timing, but then how does the plate return back to its original position? And, how would this even be possible with the bolt tight?