QuantumG thats a great idea with the wood bit...
I made one awhile back with an inverted milk jug  to give it a grain hopper effect
i cut the bottom out of the milk jug.an then cut about a 5/8" in hole in the plastic cap.
 an used couple of tywraps to secure the jug to a  piece of wood.
for the bump  agitator  i used a piece of grounding wire twisted into a ball like 
A small cake mixer.the agitator slips thru the hole in the cap an i folded the wire
 over an hammered it flat  with a large washer on it,for a bumper.
to fill it up.  i use a piece of  pvc pipe thru the fence as  a grain chute.
so i dont have to go into coup.
i had been mixing some crack corn in with there pellets . but rudy the rooster  emptyed the bump feeder in short order,  ate
all the crack corn an left 6 cups of pellets on the ground 

  . so now i just put pellets in it, an they are i little more behaved.
depending on the feed size you may need to experiment with the size of the hole in the cap
heres a short video of it in action. hope this helps  enjoy
  God Bless You