The traditional Irish pennywhistle (~ $6 - $10 these days) has a metal body and a plastic mouthpiece (fipple). The fipple is attached with a heat-sensitive glue, and the whistle, nominally in the key of D, cannot be tuned. This is OK with a guitar or fiddle, but not with a piano. (The guitar player and fiddle player can be coerced into tuning to the pennywhistle; the piano player usually gets a bit testy.) The glue can be loosened up by dipping into near-boiling water. The fipple is now movable, but very snug. Hold on to the body of the whistle with one small piece of non-skid, and turn the fipple with a second piece. Voila!
I'm sure you've all been wondering how to do this, so I thought I'd pass it along. (You're quite welcome.)
(If you have any material left over, I've heard it can also helpful to keep your cooler from sliding around the cockpit.)
Edward Joseph (Donovan) Gallaher
iggy
BTW: "Iggy" came from Grandpa Donovan, from "E" "G". My younger bro is Richard Allen ("Rag")