This kind of jew's harp can be great to learning, for me the only problems it's that the vibration is not so long, so you can't do really really nice melody.
But it's enought to offer at kids, or at friends, original and relatively easy to do it.
Step 1: What you need.
_1 piece of bamboo, like in the picture.
You can also use exacto, little scisors woods, and lot of other things, but I just want to show you the base, with minimum tools.
Step 2: Flatten the Bamboo.
So nothing difficult, just be carefull, the side of your bamboo, will become really sharp, you can work with gloves, or just sanding little bit.
This step is short and easy, but really important, if your bamboo is not flat, you will have some problems for the following steps.
Step 3: Make it right.
You can also prune it in peak, but if it'syourfirst one, I really recommand you to make it right, it's really easier.
Step 4: Draw the languet, and start to dig.
Firstly, some explanation about the languet, it's compose by two parts, the first one is really slim, this part is attached at the frame. The second part is bigger, it permit to do vibrate the languet.
So you have to draw all your marks, the languet have to be like 1 cm width, and separe the two part more or less in the middle.
After you have to begin to dig, first follow the line of your frame with your knife, and cut very well when it's perpendicular at the fiber's sens, and after, digging, you can cut in V, or use scisors wood, but dig only the fist part, slim one.