So... After some investigation it seems I understood but not solved) the issue.
The "male" part (2) coming from the "traditional" Morgan has a different milling (?) from the female one (1).
Beside this the housing of (1) is not a snug fit.
It seems that chrome arms (for Aero8) have a tighter fitting.
We will try with those as soon as my dealer get them from the factory.
Meanwhile we did the arm bending and the thing got a little bit better. We did not make the rain-x treatment since we decide to wait for the new arms to better understand the difference.
