Disassembly of joint shafts

Hello, just try to get the outer joint shaft, which is secured with an outer locking ring. So far everything was no problem, but somehow I can not separate the joint from the shaft. Since the locking ring is NOT a seagerring, I of course also could not use a seagerring tong, but a special straightened to spread the ring. But nevertheless the joint does not go away so easily. I also do not want the shaft from the i What do I do wrong – do you have to buy the special pliers available at Hazet with the very flat plates or do you just have to use violence? Does the part fit so tight? Does someone have a tip for me?