1. Add a fixing nail or something in the middle.
2. The rod replaced by aluminum alloy can be replaced by iron wire.
3. Change the way of tying the rope.
Knots are: half knot, which is the basic knot of all knots. The purpose is to prevent sliding or from continuing to take off the thread when the end of the rope bursts. The disadvantage is that when the knot is tied too tightly or difficult to untie. Eight-character knot, simple and easy to remember.