Thw wooden ones were used for training.
All you need to make one is a 70 * 15 cm (27 * 6 inches) piece of wood with a thickness of about 2 cm (0,8 inches), a saw, sandpaper and the stencil.
Step 1: Print the stencil
The first image shows the stencil when it's out together. The other three pictures should be printed on A4-pages (A4 is about equal to the letter format in the US), then glued together and cut out. Don't forget to cut out also the space for the handle!