But Harm is also a nose flutist and, as some of us did (check here, here and here), had the idea to transform a referee whistle into a nose whistle.
Harm cut a solid piece of brass and soldered it to the whistle, after having removed a part of the sounding cylinder. He got a very nice shape:
All photos by Harm J. Linsen
And to protect the flute, Harm made a funny and clever case with coasters (which absorb the moist from the instrument):