How to prevent air metering screw from moving or backing out?

In most instances the metering screw will stay put. In the rare case where it may move, a jam nut style metering screw is recommended to lock it in place. Order part number 94-6202-J which includes a threaded metering screw and jam nut.

The Coolubricator^™ gives simple and precise lubrication. Two types of pumps are available: atomizing pumps that provide an air and oil mix, and oil-only pumps. Their modular design allows multiple pumps to be stacked together when more than one output is required, so each system can be tailored specifically for the application. Each pump stack includes a stroke adjustment for the pump output and a pulse generator to control the cycle rate of the pump. Atomizing pumps also have an air metering screw to regulate the output air flow. The combination of these adjustments gives complete control of the spray output.