Vacumn advance can adjustment screw, info please.

If you can't use the old vac. advance, try the Crane 99619-1 vac timing limiting plate. It was made for the Delco dist. but it should fit. I have a rebuilt vac unit that was rebuilt but the diaphragm wouldn't seal. But I can't locate it to verify the fit.
You could make a stop held by the mounting screw to limit the travel of the plunger.
SpeedyEd