Changing rear U-joint

[circut]

alright guys well I bought the 30$ rear u-joint for my driveshaft. I got the
driveshaft out just fine and dandy, but 2 of those little round things that
are inside the shaft itself will not come out.

I got this shitty manual which has been of no use whatsoever which
says you need to remove some C-clamp things. However, when I put
it into a vice to try and get em out, I ended up breaking the vice.. And yes
I did put a smaller socket on one end of the old u-joint, and a much larger
one on the other side of the ujoint.

Is there some trick to doing this? Keep in mind this is the rear ujoint.

Thanks much,
-Erik

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2002 6spd Z28 5.7l

[Injuneer]

The stock U-joints have an internal nylon lock that has to be melted out with a torch. You can press and pound the crap out of them, and they won't budge until you melt out the nylon.