Còi Butt Plug để Tạo Âm Khi Xì Hơi

This is a prototype. Different sizes may be appropriate for different people, so, for reference, this butt plug is 26mm in diameter. This may be too small for seasoned individuals.

Please give me feedback so I can improve upon this design. I'm skeptical of the location of the windways, particularly whether they're far enough down the shaft to be able to vent. I have them currently arranged for the most optimal sound production, but if they are blocked when in use it is possible to move them while remaining functional.