Which Hex key size is needed for 2404H horn?

[Ruediger]

I want to remove the horn from a 2404h. Which hey key size do I need? We have metric sizes here, I need to order such a key.

Thanks
Ruediger

[Mannermusic]

I want to remove the horn from a 2404h. Which hey key size do I need? We have metric sizes here, I need to order such a key.

Thanks
Ruediger

9/64 inch (English). The equivalent metric would be 3.57mm . So it goes.