Its my first post here. I'm guessing the readership here overlaps with that at Melodeon.net, where I posted a question similar to this one, but just in case here it is here. I did find flutina related discussion in this forum, so perhaps there is someone here with an answer to my question.
I am planning to make a reproduction flutina, having valves on both sides of the keyboard, as in the attached picture. What I am not sure about is how a lifting action for the valves is achieved for those at the backside of the keyboard. I am thinking the levers for those valves must be hinged at the top part of the keyboard, although pictures available on the internet (all I have to go by) do not show this detail. I attached a rough sketch of a typical valve and lever mechanism for the front valves, and what I think the back valve mechanism might be. Is this right, or is there some more complicated mechanism involved. Any help, or pictures to show this detail, would be greatly appreciated.