You will need short branch (I used a piece from an apple tree), 2 strands from a cotton mop, and beads (I used brightly coloured pony beads)
Drill a hole near both ends of the branch.
Push the taped ends into the holes and pull right through until you reach the first bead. It should be a fairly tight squeeze to get them through.
Please take a look at my Budgie E-Book written after many years of experience with these wonderful little birds.