I only remove U joints when they are bad. If they are toast, open the jaws of a vice just enough so that the yoke fits in there vertically, with the flange resting on the jaws of the vice. AFTER removing the circlips, hit the yoke with a hammer, this will drive the top cup out. Flip the DS over, and repeat on the other side. Pull the U joint and all is good.
Using a flame can easily melt the plastic seals in a Ujoint.
Using a flame can easily melt the plastic seals in a Ujoint.