Another wood for whistle plugs
Picking up on a comment by Ceolachan in another discussion: https://thesession.org/discussions/44630
At one time I made wooden whistles, and since I live near the edge of ´The Great Western Sea´ I had ´western red cedar´ in abundance. It makes excellent whistle plugs. It is extremely dimensionally stable when wet. Additionally, it is extremely rot resistant. Technically, it is called ´Thuja Plicata´, which is actually in the Cypress family, and not a true cedar.
On another musical note, pun intended, I have had success making Uilleann chanter reeds from it, and find it quite stable in wide swings of humidity. The North Coast First People found the tree so useful and versatile, it was regarded as a sacred gift.