When I was in HS it was very common for folk in woodworking and industrial arts classes to make shivs out of cut and shaped plastic (2-4mm thick lucite) and wood.
The lucite was supplied to us in sheets with paper backing on both sides. You draw out your shape and then get to cutting with a bandsaw then finish the surfaces with a mounted belt sander. Making knives from pine wood worked similar. All one needed was desire and one class period of time. That was 1984 to '88.
What will England do tomorrow when the criminals and like minded kids stop using conventional magneto or radiation emission detectable materials like wood and plastics?
- Mac The Knife