If you ever tried to print the whistle with the ball in the middle (which is kinda pointless), but were unable to get the roof to print right, or seal well enough to blow, then this is the solution.
I just turned the ball into a center column which allows for easier gap bridging.
This is a derivative work of Whistle by Zaggo, thing #1046.
I can't seem to be able to find out how to officially link them.