I inherited an older friends father's nest boxes--8 hole galvanized (I think) metal. Most of the removable bottoms have rusted. I thought it would be simple to replace the bottoms...After a lot of internet searches, I realized that I was wrong! Here is a pic of the bottom. They sell lots of similar bottoms, but with out the hook at one end. Does anyone know if these old ones can still be found somewhere? Thanks for any help!