I got my thingamajiggy in the mail yesterday and looks just like the pic from jmagill. I was dying to see how it worked, so I poked a hole in a coffee can, inserted the device, added some feed(crumbles) and it seems like it will be o.k. The "T" end goes in the container and acts like a baffle of sorts to regulate the release of the feed.
My only advice so far is to make the hole in the container no bigger than necessary to get the end that the chickens peck through the container. Supplier recommended 12mm hole when using crumbles, which is just about the size of the end piece that has to go through the hole. It seemed small but in use it released quite a bit of feed.
I'll post pics when I've had a chance to get it permanently installed. After seeing the video, and recently introducing my chicks to nipple waterers, I don't expect any problems getting the chicks to use it.
Annie