The Equalizer 4 point hitch is designed to be lubed (and should be lubed) on the top and bottom of the hitch head sockets. Says so right in the manual. I lube mine liberally at least every 500 miles, most of the time before each time I tow. I have 16,700 miles on this hitch and follow what it says in the manual, not what some people say on here. Loosen the bottom nut until the socket swings freely, lube the contact points and then torque to 50-60 ft lbs. I use 60, some people use more and some people use less, use whatever works on your hitch.