Someone sent me an instruction sheet on this last year, can't remember who, and can't find the sheet. So here's my own version of it:
What you need to buy:
1/2" socket (1/4" drive)
1/4" x 1" machine bolt
1/4" tap
13/64" drill bit (came with tap)
1/4" x 1 1/2" Washer (or thereabouts)
Step one is to back out the decapping mandrel so you don't drill it. You don't have to remove it--just withdraw it enough that you can drill the hole through the case head.
Place the die in a vise or something to hold it steady. Then drill out the primer pocket w/ the 13/64" drill, and tap the hole:
Push the bolt through the washer and socket, like so, and thread it into the newly tapped hole:
Use a wrench to tighten the bolt, and it will draw the case out of the die, like so:
I had to cut off the end of the shell so as to be able to remove the expander ball, but you could also cut off the head of the shell.
It works--I've pulled several stuck cases with it.