I have ordered and used these feeders for probably 10 years or more. Feb 2016 I ordered a new one for the current summer. My old feeder continued to work through the summer and just broke last week. No problem! I have a back up just in time for the August swarm of hummingbirds. Got the feeder out today and guess what? It is defective. The two tiny plastic catches on the back won't engage. It is like the cylinder is too long or something.  And it is too late to send it back to Amazon saying it is defective. So I will have to eat it. NOT HAPPY. nuff said. Unhappy customer wants a new feeder free. Oh, and there was no screw to apply the rest beneath each port.