"A" Body 67 Barracuda rear end problem

I'm a little familiar with pop's dilemma, as we spoke about it briefly in his "welcome" thread.

The possibility of brass has me puzzled too. If you haven't already, take a magnet to the shrapnel just to confirm it's not iron/steel.

One thought I had was the possibility of a roller out of a bearing floating around, but I can't see how one could get loose in there, unless it was somehow left in the housing from a previous catastrophic failure?

I'll just wait on some pics with y'all. :D