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Recently got an all metal book bin from an auction our library held.  I want to convert it into a feed storage unit and auto feeder.  I have plenty of scrap metal around for fabricating.  I'm thinking something along the lines of a treadle type set up but can't quite flesh it out.  Pics attached show the pre-fab slot at bottom of bin, and I will be taking out the springs & tray inside. Was thinking maybe those springs could be used in the design?   All advice welcomed.  Thanks!