The adjuster is the variable transmission between the meter element and the register. It is adjustable so that drive between meter and register indication are synchronized for accurate recording of liquid flow by volume. For easy access the adjuster is located directly behind the sealable LC emblem face plate.
The adjuster drive shaft is driven directly off the blocking rotor and, in turn, drives a hardened, ground tapered plug. The plug has a circumferential differential from one end to the other of 5%. The plug, drives within a nest of six balls. The balls, in turn, are held in place between the tapered plug and a split race. The bottom half of the race is the changing plug circumference introduced within the nest of balls as the adjuster setting is changed. The balls are contained within a ball cage, which, in turn, becomes the output drive to the counter.