You can use:
• plastic coated wire
• stainless steel wire
• Surflon
• Softstrand type wires
• nylon cord

Bring the wire out of the ring from the bottom
"The rabbit comes out of the hole"

Twist the wire once around itself.
"Runs around the tree"

Thread the wire back through the ring.
"The rabbit goes back down the hole"

Twist off the wire around itself several times.
"I don't know...maybe the rabbit learnt the twist"

Trim off the excess wire with wire cutters.
"Oops...look out rabbit!"

Repeat the process for the other ring. Set the length of your wire by folding it over in the second ring using your index finger like a hook.

The wire should be slack.

Click here to look for the reasons.