Small mechanical siren for nano drone motor

This is a small siren for a toy drone motor (like Cheerson CX-10, 6x12mm round motor with 0.8mm shaft. It could be used for example in some toy police car or fire engine or a small alarm clock. It makes a high-pitched shrill rather than usual siren sound at full loudness, but it can sound more siren-like when rotating slower, only it's not that loud due to lower amount of air being moved. At 3.6V it goes to 92- 94dB measured with my phone in direct proximity to the siren. The siren rotor should