I had Eric Anderson at Midwest Musical Imports custom design and build this mechanism for a Wolf bocal that I have. The idea was to create a key that opens a pinhole drilled in the bocal, operated by the right hand, and have the entire mechanism completely independent of the rest of the bassoon.
All posts tagged high g
Harmonic flagolet key for bassoon bocal (high G key)
Posted by Trent on May 27, 2011
https://tjbassoon.com/2011/05/27/harmonic-flagolet-key-for-bassoon-bocal-high-g-key/