Near as I know Sal it was a fairly viscous grease placed the the grease "cups" on machinery (shafting) with sleeve-type bearings. The headstock of my old screw machine (metal lathe) has them. Usually have flat threaded and knurled caps to keep contaminants out. Not to be confused with the oilers on babbit bearings. Miller Fulks' description of the Lefever rubdown procedure was posted on the Lefever Arms collectors site recently.

jack