Best & Lloyd Light Plunger

The Light Plunger-Part Nr. 104-462
Best and Lloyd part number 761.
A brass part which sits on top of the Plunger Spring which pushes the brass Light- Plunger against the base of the Regulating Valve screw wheel.
Suitable for both the early Best and Lloyd oil pumps with the 24mm diameter tubular oil sight glass and the later Post -1923 version with the 36 mm disc type oil sight glass.
It provides a method of maintaining the Regulating Valve screw wheel in the position it has been manually set to so that the oil drip rate is predictable.