Material that can be prepared with ease by hand

Preparation method and tools
Use pincers or pliers (car maintenance tool) or a butter knife.

Order of making
1) Bend the urethane rubber into the U shape.
2) Heat the butter knife to a temperature (approximately 300 degrees) at which the urethane rubber dissolves with gas fire.
3) Lightly sandwich the heated butter knife between the urethane rubber joints and gently press it with pliers. The rubber will melt moderately, at which time quickly withdraw the butter knife and press down the rubber for about 20 seconds to finish the rubber.