The PP Swager die is a primer pocket swaging die. Used to remove the crimp from military brass. The "shellholder" that you've got pictured next to it is the punch that does the swaging, and the rod in the die is adjustable so that it supports the inside of the case head.
Normally, the set comes with punches for both large and small primers. The one that you have looks to be the small primer punch.
And nice find on the 007 too! That's a good solid press and definitely worth hanging onto.
The aluminum block is the holder for the auto-feed primer tube. Your press is missing the primer ram. BUT...you can still get these parts from Hornady if you would want to get the press complete again.
As-is, it's still perfectly functional except for the priming arm feature.
Look at their current Lock-N-Load Classic press and you can see what the complete setup should look like. http://www.hornady.com/store/Lock-N-...lassic-Loader/