Niger Thistle Seed Bird Feeder.
Finches (and similar) of all kinds love this stuff.
Designed to use the thistle seed feeder socks commonly available at pet or garden stores, or online. It can use either the tie-on or the elastic top type. This version holds a single sock. For a triple sock version, see my previous upload of Thing # 4625966. This version holds 1.5 to 2 lbs (0.7-0.9 kg) of seed.
Use a wire or string through the center holes, with a knot or some other stop at the bottom. Leave enough room that the top (cover) can slide up the string or wire so that you can refill without disassembling.
You will definitely need supports for this, unless you've got killer bridging settings.
Photog1
