Hi Nick...
OK...this what I found out: any sleeve bearing such as the top bronze sleeve bearing on a Hoover,even and older Hoover, Eureka, etc, DOES NOT TAKE ANY GREASE...SIMPLY CLEAN THE SLEEVE WITH A Q-TIP. The bottom bearing is a ball type and DOES require greasing. I got this information because I was curious about my older, not Convertible model, Hoovers that have sleeve bearings. Guess I may have ruined many of my older vacs by greasing sleeve bearings. Oh well !! Worse things have happened! ;-D