Tor wrote:
I completely understand the OP - I have one of Guido's whistles, and it does play beautifully - unfortunately it's not tuned exactly to concert pitch, so in practice I can't use it. Therefore I looked into making one myself, following his plans and having the sample in my hands.
I can't do it, it's out of my league.
Is it sharp or flat? Out of pitch overall,or just with itself? There's a simple way that you might make it tuneable,particularly if it's flat. Find a PVC coupler of the right diameter. Cut

the head off the whistle around where you think a slide should go. I think the Gonzato instructions will give a good idea of this. You can get special PVC pipe cutters,but a hacksaw works just fine. Be careful not to inhale the dust!Remove the burrs and put the whistle together.
The whistle will probably still be flat,maybe even a little flatter due to a ridge inside the coupler. Working very gradually, shorten the top of the body section. Couple of millimeters at a time. The hacksaw may be a bit crude for this. Try coarse sandpaper,or a grinding wheel if you have one and are comfortable with it. Test the tuning and repeat until the whistle is up to pitch.
If the whistle is sharp you may still be able to bring it to pitch.Add a coupler as above but don't push the sections of the whistle all the way in. This might be enough to get it to the correct pitch.
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