We had a similar problem with our boy and a bin feeder- I read an idea
somewhere (Don't remember where) that worked well for us....  Get a small
tupperware (or other plastic) container with a lid.  Cut a ferret-head sized
hole in the top and put the top back on the container... viola!  Meth still
kept flipping it over so we glued a big magnent (sp?) to the bottom and now
it sticks solidly to the metal cage bottom.
 
Good luck!
 
The bridle enterage
[Posted in FML issue 1863]