Production order

Fold the urethane rubber into a U-shaped shape.Heat the butter knife up to a temperature where the urethane rubber dissolves with a gas fire (approx. 300 degrees).Once the heated butter knife is sandwiched into the urethane rubber joint and lightly press it with pliers, the rubber will dissolve, so when it melts well, quickly remove the butter knife and press it in for about 20 seconds to make it easy.