Fill the cup with fairly stiff grease, and give it a twist at every oil change. The lubricator is a 2-piece assembly, with a part that threads into the housing, and a cup for the grease. A cup full will last several years, usually. Quite often, the grease is so gummy it has to be dug out with an ice pick or something similar when the distributor gets serviced. The male thread part of the grease cup assembly that threads into the distributor housing puts pressure on the spring, so all the grease does is keep the upper part of the shaft lubricated. A slice of plastic 1/8"-3/16" thick will last for several years of every day operation, as long as the shaft that it runs against is smooth.
Jerry
