Pardon the digression
but while we are discussing balls, lube, etc.... I have another problem that I sort of found a solution to because the hitch ball was stuck. Lifting the whole thing is a little too much for me sometimes, especially now that I have Enkay mudflaps that also weigh down the hitch bar.
So, what I have been doing is leaving everything attached, releasing the tension on the WD bars and pulling the pin on the hitch bar/receiver and sliding that out. I leave everything hanging from the trailer hitch.
Practicing has made this as easy as aligning the ball with the hitch
I use the rod/pipe for raising and lowering the WD bar chain mechanism to sit the bar on when I aim for the receiver hole. It seems it wants to flop down if I don't.