Brain Dead Moment

So I put empty brass in the tumbler.  A mixture of 9mm, 357, 45acp and 454 was in for cleaning in ground walnut shells.  That was a brain dead moment.  The 2 smaller diameter brass will slip easily into the 45 caliber brass, except when walnut grit is present and vibrating.  Something like 40% came out stuck inside the other.  Separating them was a real pain in the ass.

Since I hadn't cleaned the vibrator, separator or changed the medium in years, I cleaned both and changed medium.  As I type this only 45 caliber brass is now tumbling.