A good idea is to make note of the slack (movement) between the drive gear and the cam when new. Then it's easy to detect wear if the thing is getting sloppy, by popping the distributor and checking with a large screwdriver or tool.
Or visually compare used to a new one.
Last edited by CMcAllister; 04/01/1912:59 PM.
If the results don't match the theory, change the theory.
