Cookie Tin Tambourine

Step 3 Make the holes

Fold the corners of each cross back so you get a hole. For the hole without caps (i.e. the one you can put your thumb through to hold the tambourine), fold all de corners all the way.
For the other holes, it might be easier to keep 2 diagonally opposed flaps bended only halfway (like the upper right one in the picture). This makes it easier to slip in the caps in the next step.

Make sure (especially for the thumb hole) that you bend in the 4 flaps completely, so you don't end up with sharp edges that can make nasty cuts...