Not this one!
The right side spun straight out but the left is absolutely immovable. I made a special tool from thick-walled 3.75" od 4140 tube, with four prongs on it to locate in the slots, welded to a big 3/4" drive socket. I have tried all kinds of heat, an impact gun, and a breaker bar with a 5 foot extension on it and it will not move. I think someone has either epoxied or loctited it in - although I can't see any evidence. I have never seen anything stuck so solid in my life. I have to get it out because the axle has 0.100" of end-float and the inner seals are shot.
So, does anybody have a spare retainer, (pictured)? Before I get medieval on it...