Guitplayer... screw that cup off and fill it with whatever grease you use and screw it back on. Each time you screw it in some it lubes the distributor shaft. I give it a little turn about every 500 miles or so. Some do it at each oil change. Lots of folks never did it back in the day because they didn't know.

~~ Jethro
1954 3100
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1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020