The Air to air catches most of the debris, I'll look for the nut in there. Cement/concrete, I still don't get the difference and I breathe it all day. I guess I should use the proper term, "Mud". Yeah, we killed the load and poured it out. An auxilary power source would be cool, we have jumper lines to have another mixer turn it if we ever need that, but so far we have always been able to kill loads or even transfer it to another truck.
CMark, I can't say the true order of events, this is just the first time I've seen the nut gone, maybe I can do an autopsy.