The knife from a blade for shaving
Blades for shaving are thin and sharp, soThey can successfully cut various materials, if at hand there is no normal clerical knife. However, this is not entirely convenient, plus there is always a high risk of cutting your hand. But there is a way out, you can make the blade safer and more convenient. To do this, just insert it into the metal loop and secure with screws. 
You can go further, and make something like a handle for the blade of a piece of wood. But it's better to buy a stationery after all. It is more convenient, safer and very inexpensive.
