Since it seems that I am not the only person here who's got a steel
support rod popping out of the the lower mattress from time to time, let's
have another go.

  This one's a case of non-support.  Has anyone ever had the front half of
the top mattress fall off the lip that is supposed to hold it up?

  I tried finagling the hinges & screws on the sides of the bus and the
ones on the surface of the board, none of which had actually been designed
to be adjusted.  These "fixes" were short lived.

  I ended up removing a plastic molding and tnhen screwing a furring strip
onto the rear edge of the board so that it would make full contact across
the horizontal supporting rail.  Painted it grey and you can't hardly tell
there's been workaround.

   And now, no more worries about plunging into an active kitty litter box
in the dead of night.

Geo/ATL