The Series A19 is a small, compact control with
adjustable or fixed differential. Controls supplied with
adjustable differential have an internal scale plate
indicating increments of differential. The controls are
supplied with adjusting lever at minimum differential
stamped on the control. To adjust move the lever to
the differential required. Models are available with or
without external range adjustment and visible scale.
External range adjustment may be by screwdriver slot
or range adjusting knob.