I will show you how to easily make a wooden Butterfly knife. This is also more commonly known as a balisong.
* If you build this, I am not liable for any damages or issues that have arisen over this. Please use common sense when building this. THIS IS JUST A PROP *

Step 1: Parts

I found a template online and scaled it up. I then proceeded to cut the knife out of half and inch thick wood. This was done by using a scroll saw.

Step 2: Sanding

I made sure to sand every edge with 150 grit sandpaper to make it very smooth. After this was done, I placed the parts to see how they would look

Step 3: Test Fit

After sanding, I placed tooth picks into the holes in the handle to see how it fit and worked.

Step 4: Locking Mechanism

Don't forget to put 2 sticks at the top and bottom. These will help make the blade stop.

Step 5: Glue

I then glued the whole thing together and then sanded after it dried.

Step 6: Gap Fillers

At the very butt of the handle, there will be open space. In order to fill this space, I cut 2 pieces of wood and then glue them into place. To make sure it was a tight fit, I also drilled a hole through the whole thing and then put another tooth pick.