I just tore the front end apart on my '87 Sub 3/4 4x4. Lo and behold, the upper ball joints, (badly worn) could've been greased thru an edge fitting! No need to f*** around with the plug... But called all the local places, nobody has 'em. (NApa, Auto Zone, PA, etc... All in da middle like a bullseye. Now what? I gotta put this heap together, and living in the road salt belt, I grease every month... except the uppers. Feel free to call me, Andrew @ 518-572-6450, or toll free, (I have free LD) 888-572-6450. It's 3:00 PM EST and I'm off to the "country" for some lockable hubs.