Hi Bernd,
I tried with simple tools to unscrew the nosepiece screw but it resisted, as expected.
So I put some unblocking fluid around it and left overnight to let the solvent act on the thread.
This afternoon I will try again, and then I will start to build a proper tool to unscrew.
I verified also by a bubble level that the base and the table of the scope are parallel while the nosepiece holder is slightly tilted to the right.
What I still do not understand is how could it be possible to misplace such a robust connection well positioned by two pins.
Best regards,
Salvatore