Lay an 18-inch-long PVC tube flat on a table, and drill a 2-inch-wide hole into the side using a drill with a 2-inch-wide spade bit. Position the hole 6 inches from one end and only drill into one side of the tube, not all of the way through.
Push a hot glue stick into the back of a hot glue gun, then plug in the hot glue gun to heat up for 10 minutes.
Cut a piece of medium-gauge mesh using metal shears to measure 3 inches square.
Squeeze a line of hot glue around the perimeter of the mesh square, then press the square over the drilled out hole in the PVC tube. Allow the hot glue to cool for two minutes.
Squeeze a line of hot glue around the inside edge of a 3-inch-wide PVC cap, then press the cap onto the end of the PVC tube that is closest to the drilled hole. Allow the hot glue to cool for two minutes.
Fill the PVC tube with bird seed. Select seeds that are small enough for birds to eat them through the mesh holes.
Drill two holes through the sides of the PVC tube on the opposite side of the tube as the cap using a 1/4-inch drill bit. Position the holes 1 inch below the end of the tube.
Cut a piece of twine to measure 12-inches long, then insert one end of the twine into one of the drilled holes. Tie a knot onto the end to prevent the twine from coming back out of the tube.
Insert the other end of the twine into the other drilled hole, then tie a knot into the end to prevent the twine from coming out of the tube.
Press a second 3-inch-wide PVC cap on top of the open end of the tube, then hang up the tubular bird feeder for use.