I don’t leave the expander/de-cap stem dangling loose, not forever. With the stem’s lock ring loose and whilst pulling the neck (use a known to be concentric case) back down over the expander ball, stop about half way through leaving the expander ball stuck ~ midway still within the neck. Using the ram, put a little upwards pressure on the stem via the stuck expander ball to shove the stem upwards until it tops out in the play in the threads of the stem and die, the upwards pressure on the stem will also have it tend to settle centered within the threads. Holding what you got, now snug tighten the stem’s lock ring (or nut) to keep the stem topped out in the threads’ slop and centered and square within the die. Floating carbide replacement expander balls help too.
Doing the same sorta deal to the die body before putting the snug on its lock ring will help to center and square the die within the press’s threads. If in adjusting the die it ended up backed out too far away for the ram/shell holder to shove upwards on the die’s base, place a known to be flat, flat washer on top the shell holder making up the difference so it’ll be able to reach to the base of the die.
Trash any die body lock rings that thread straight up against the die threads to lock it in place. Replace them with the cross bolted style of lock rings.
Trashing the ram’s shell holder retaining clip in favor of an o-ring will allow the shell holder the freedom to better align itself, and so the case, with the die.
Doing the same sorta deal to the die body before putting the snug on its lock ring will help to center and square the die within the press’s threads. If in adjusting the die it ended up backed out too far away for the ram/shell holder to shove upwards on the die’s base, place a known to be flat, flat washer on top the shell holder making up the difference so it’ll be able to reach to the base of the die.
Trash any die body lock rings that thread straight up against the die threads to lock it in place. Replace them with the cross bolted style of lock rings.
Trashing the ram’s shell holder retaining clip in favor of an o-ring will allow the shell holder the freedom to better align itself, and so the case, with the die.