Centering Spring (All Vehicles)
If Cruise Control holds speed three or more MPH above that selected, turn centering spring adjusting screw (on regulator) toward "S" 1/32 of a turn (Oldsmobile) or 1/8 of a turn (Pontiac) or less. If Cruise Control holds speed three or more MPH below that selected, turn centering screw (by amounts listed above) toward "F".
CAUTION:
Do not move adjustment screw marked "R". This is a vacuum restriction adjustment screw and is pre-set at factory.