Well, I think I have had too much time on my hands.  I wanted to try changa, and I did not want to  spend ludicrous (>$60 and up towards the stratosphere) amounts of money on a glass 'tobacco' pipe at the local head shop.  So I got a few of these 500 ml volumetric flasks on EBay for $9.25, a stem and bowl for $3, a black grommet, a couple of diamond bits (0.5" and a 0.1875" ).  I know that you European guys love those SAE (society of automotive engineers) sizes!   
I played around on my drill press using cooling water from a spray bottle and using cautious light pressure.  10 minutes later and voila!!! Here is my new Changa pipe....
Rivea attached the following image(s):

 changa_pipe1.JPG 
(389kb) downloaded 208 time(s).
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(387kb) downloaded 207 time(s).Everything mentioned herein has been deemed by our staff of expert psychiatrists to be the delusional rantings of a madman who has been treated with Thorazine who is hospitalized within the confines of our locked facility.  This patient sometimes requires the application of 6 point leather restraints and electrodes at the temples to break his delusions.  Therefore, take everything mentioned above with a grain of salt...