you need to have the JR series of press , as the ram has to be swapped out with the ram include in the tool.
The "die" tool is screwed into the top of frame like a regular die, it has the LR dimensioned swager ground on the end of a 3/8" threaded rod.

The case is place over the small diamter rod, sticking up from the ram, raise the ram up to contact the swager, then adjust the swager to open the crimp. loswer the ram, id case stay on swager then raise the swageruntil the case drops off. reposition swager and repeat.

If it the current system for both LR &SR primers, the swager is a modified shellholder that fits on the current press ram and the case is placed in a "Die" type tool that use the body of case to hold and the swager pushes the crimp. Aas you lower the unit the case pops-off by stripper unit.