More questions for those who have the feeder. Is assembly difficult? I am reading the instructions, and they don't completely make sense. I am hoping actually having the feeder in front of me would help.
Also, it says attach to a building or post. Will sitting it on pavers work, or do I need to set a post into the ground?
Finally (maybe) for those who have it, what size do you have for how many birds?
You found the site ending in .net, correct? It has the videos on repair, installation, training, and tons of customer supplied videos. you basically slide a washer on one of the bolts, stick it through the side of the feeder coming from the inside pointing out, add the second washer, then the hex nut and tighten the stuffing out of it. Repeat for the other side. Hang the treadle bar making sure the small hole in the side of the treadle bar is on the right side under the door axle crank. Add the lock nut, tighten it down snug with a wrench, then back off 1/10th to 1/8th of a turn so the treadle rotates freely. Hook the wire link, the shorter end if there is one, in the door axle and bend it over 180 degrees. Push the wire link from the center of the feeder outward. That keeps the wire link on the inside of the treadle and door axle crank. It needs to be free to rotate without flexing the wire or it will break under metal fatigue. Insert the bottom end through the treadle hole and bend it up 180 degrees, into a U shape. Again, not tight, let it rotate easily. You are done.
Installation, there is a french cleat made out of sheet metal in a kind of z shape. Set some patio blocks up where you want to mount the feeder, two or three work great, lots of landing room in front of the treadle step so the birds can hop up and then work the treadle. Push the feeder against the wall or post and run a pencil mark along the top of the feeder. Remove the feeder and mount that french cleat around 1/4" below that pencil line. Holes should be pre punched but make your own if needed. Then hang the feeder over that cleat, the wire lid axle hooks in behind the top of the cleat. You can lift the feeder off for cleaning or if a squirrel commits suicide trying to get into the feeder.
No wall or post? Set the pavers and set the feeder, then set one heavy paver on top to prevent the feeder from tipping when it gets close to empty and a heavy rooster jumps on the treadle. Or, drive some 2 x 4 stakes into the ground, mount a 16" x 24" chunk of plywood to the stakes, cut a 2 x 4 block that slips under the feeder, screw the wood block to the plywood, run some screws through the sides of the bottom of the feeder to secure the feeder to the wood block. Or just drive the stakes into the ground and screw the feeder to the stakes.
Feeder to birds..... how many days do you want to be gone without running out of feed? Balance that with the morning traffic jam at the feeder which the hens will work out based on their pecking order. Figure 120 days of feed for one hen per medium feeder. Ten hens, empty in twelve days. Fifteen hens, more like eight days. Once you are over say 16 hens you should have two feeders, out of the line of sight of each other if possible to help to reduce competition if you have a bully hen. You probably can get by with one feeder for twenty hens if you are on a budget, so six days before empty. You can always add one later.