To address the extrusion mold shut-off challenge, the solution involves precise mechanical modifications and specialized tools. Below is a concise breakdown of required components:

### Tools

- **Welding equipment** (for tack-welding steel plate components)
- **Drill** with 4mm and 20mm drill bits (for hole creation)
- **Hammer** (to slide/close the arrow-shaped mechanism)
- **Measuring tools** (calipers/rulers for metric/imperial alignment)
- **Pressure testing setup** (to verify seal integrity)

### Hardware

- **Steel plates** (with matching dimensions/hole patterns to existing mold plates)
- **Alignment pins** (4mm and 20mm diameters for positioning)
- **Security pin** (4mm diameter, spans all plates when open)
- **Screws/bolts** (for nozzle plate attachment)
- **Nozzle plate** (modified with welded arrow-slide components)

### Software

- **CAD software** (for designing shut-off geometry and hole alignment)

These components enable the creation of a reusable, leak-resistant mold system. The process emphasizes precision in drilling (±0.5mm tolerance) and robust welding to withstand extrusion pressures exceeding 50 bar[1][3].