Got a pair of used re super flex arms, look in very good condition but one was loose so undecided to grease it tonight. Before I did that I took the zerk fitting off and tried to get the Allen screw off but that wouldn't budge, played with it some more to get it looser then put the fittin back in and tried to grease it. None of it is staying in the joint. Coming out the side with the snap ring. Any ideas?