Tech/maintenance Adjustement octave/thumb operating mechanisme

[Sjeng]

I had an adjustment made because this is necessary because of my problems with thumb/hand. It involves operating the octave valve. The thumbrest itself is raised and not visible in the photos. The photos have been edited because I have deleted everything. It was so unplayable for me. The adjustment is brass in the photos. Light blue is the original mechanism.
What do you think of this adjustment where I also have to press the support sideways with the thumb to achieve a downward movement? So the thumb has to move forward (in its longitudinal direction) AND down. For me it is not a good ergonomic solution.

 

[lydian]

Can you describe your thumb problem a bit more? Is there a certain range of motion that doesn't work anymore? Your solution would be unplayable for me. The way I play is to place my thumb joint on the rest with my thumb pointed at an angle of about 2 o'clock, and simply bend the thumb forward slightly at the joint to operate the octave key. Will your thumb no longer bend or roll?

 

[Sjeng]

A problem is that my thumb is very flexibel. I can push the thumbrest but not back. My thumb is very flexible and will go in the wrong position( image) I use a brace. But at the moment there is no solution for me. As I mentioned, I have removed the keyadjustment. I play the middleregister with voicing , so witout octavekey.

 

[lydian]

Hmm. That's a tough one. I don't have any ideas.

 

[Sjeng]

Hmm. That's a tough one. I don't have any ideas.

The image is ONLY showing the hand/thumb position when releasing the octavekey.