The middle part, the X, has a cylindrical bearing surface on each of the four ends, around that bearing surface are many pins, maybe 1/10 of an inch in diameter and 5/16 long. Outside of these pins are caps. These caps are the round pieces in the outer bosses, under the spring clips, which look like raised Pi's. Thoroughly soak the whole thing in some penetrating oil, or Automatic Transmission Fluid. Maybe overnight. With a narrow ended pliers, compress the sides of one of the Pi's and squeeze the sides together. Lift the clip out of the depression (do this in a plastic bag, else the clip may go into orbit.) There is some merit to doing one at a time, also to doing all four at once, or two at a time. You are on your own here. Once the spring clip is out, very carefully scrape the dirt away from the inner diameter of the boss 'cause the cap has to come out passed it. If you have removed two opposite spring clips, Find the two sockets JD mentioned, one to go inside the cavity and one for the opposite cap to go into. Get also a C clamp that will go over the whole thing and a plastic bag that will go over the whole thing, too. With the bag and sockets and C clamp in place, tighten the clamp until the pushed clamp falls into the larger socket. Very carefully take everything apart that will come apart, (without loosing any of the pins (needle bearings)). Its a toss up if the X will come out at this point. If it will, be careful to catch all the needle bearings. If not, use the C Clamp and large socket to remove the other cap. Do all this again to get the other two caps off. (don't loose any needle bearings) Wash it all with (I like kerosene) a solvent and let it dry, or dry everything with a paper towel. (Cloth fibers will not go away, paper towel fibers will.) Inspect for rust on needle bearings, inside the cap or on the X bearings. Any rust, or black marks, get new ones. [edited here to answer question] Grease everything, put it together very carefully, often a needle bearing will fall into the cap and it won't all go all the way together. Be aware of this possibility. And put the spring clamps back in. Keep a hammer handy, just in case my method doesn't work. That was easy, wasn't it. Tom Bredehoft