Hi MiTasol,
Thanks a lot to join me on this adventure
For me it looks that the longest bars has a kind of Y (nr1) part on the left side of it. There looks to be a short "leg" and a longer "leg". At the end of the long "leg" it looks to have a part that is fixed to a part that is on one end attached (left side) not 100% clear... and at the other site to the part that has a curved form and looks to be movable by the part that is connected to the part attached on the long "leg" of the Y.
Also based on the second picture is looks that there are like a double lever at the end that is then connected to the left side of the curved part...
On the section with the "tube" that is attached to the left side of the long parallel bar it seems that at the end there is a rectangular plate with a hole in, on top of that plate it seems that (based on the first picture) there is a hood/cup mounted on top with also a hole in... so could this indicate a kind of selector/switch was mounted on the top of the hood/cup part...
Assuming that the lever parts are part of what we are looking.... so quite close to the curved part... it looks that in the first picture the lever is protected by something.
Having a closer look to the short leg of the Y part... seems that this part is attached to a part with a square hole in it and is attached to a part that is resounding the tube part...