Charlie Hood indeed!
It's hard to hide anything from Google. Actually, I invented it and asked Charlie to make it for me. He didn't think it was worth making the second one since nobody but me used their cases until they disentegrated. Pretty simple deal and works like a charm. Everybody ought to have one if only to loan it to folks like me.
It's a 2 inch cylinder the same diameter as a Wilson bushing with a .250 hole ( for the typical 6mm) through the center and a tight fitting knock out rod that goes in the hole. You just screw the top off your neck/bumb die, stick the device on top of the bushing and hit the knock out rod with whatever is handy, Voila! No need to screw the die out jeopardizing those deadly accurate settings.
And...as far as using a brush....I'm talking "my" cases here. The ones that look like they've been in a real bad oil fire where people died.