I have done this using a metal wire and it can be done using a thin or thick metal rod. Materials required: (1)Metal wire or rod. (2)Cutting plier.
Step 1: Take Two Straight Wire or Rod.
Step 2: Bend the Wire or Rod Into V-shape at the Middle.
Step 3: Bend Into V-shape at the End of the Wire.
Step 4: And Now It Is Ready.
Attach a rope or make a loop at the long bend where my finger can be seen to make a chain linkage.