materials you will need are:
21 1/2" piece of 1" sch 40 PVC pipe
a coping saw
a unibit and drill
an xacto knife
100 and 220 sand paper
angle measuring device
Here is a link to a video of how it sounds. Keep in mind that I used a picture camera to shoot the video so the one you make will sound richer. http://www.youtube.com/watch?v=OJ90ipNFKE0
P.S. I had to use a link the embeding thingy didn't work for me.
Step 1: Step 1
make a 2 marks about 1 1/8" wide as indicated by the red arrows and 9/16" in as indicated by the black arrow.
Then draw an ellipise connecting them and cut the section out with the saw.