I've got one of each of these. They work prefectly, ahd them for over 5 years with perfect operation. The perches have springs which are strong enough to keep the feed tray open when there is a bird sitting on it, but not strong enough for the weight of a squirrel. If a squirrel gets on the perch, the tray closes. I paid less than they are listed for here at a local farm supply store.
http://www.duncraft.com/Heritage-Far...r-P383C34.aspx
