This is an easy fix. Drill a hole in the case head slightly larger then the primer pocket. Tap the hole. Buy a bolt with the same thread size, and about 5, one inch round washers, with a big enough hole for the bolt. Thread the die into your press from the bottem up, so that the case head is well below the top of the threads on the press. Stack your washers on the top of the press, and thread the bolt through the washers, and into the tapped hole in the case head. Tighten it down until the case comes free.
A word of caution: Buy the best grade bolt you can. I made the mistake of using a regular grade 3 bolt one time, and broke the bolt off. I then had to re-drill the case to get the bolt out, and tap to a bigger thread size.