1. The head of the pull nail is inserted into the connecting material through pre-drilled holes.
2. The tail of the pull nail is stuck on the other side of the connecting material.
3. The tail of the pull nail is tightened by pliers or other tools, causing its plastic flow (usually understood as stretching) until it extends to the bottom of the shell.
4. The extended part is combined with the shell by deformation and cold hardening to achieve a firm fixation effect.