Drill & drill bit
Step 1: Another use for a file divider
Move down the metal strip until you reach your desired length. Bend both ends down at 90 degrees until you have a rectangle. Cut the free end as flush as you can to the pendant.
Step 2: Solder and drill
Place the rectangle back onto the pliers and use a punch to make a starting mark for the drill bit. Do this on both sides. Drill a hole and keep the drill bit handy.