Cut a circular (foam material) disk that fits into the bottom of the bottom bucket.

Angle it downward on a 45 degree angle.  This helps move the corn on the edges, down and into the center hole. 

Stack another container on top (cut out the bottom of the top unit)

Add some sheet metal screws to hold the two sections together (Caulk seam).

This increases the capacity of the feeder beyond 3 weeks.

Another large capacity feeder from a small plastic garbage can:

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