Can I reduce the height of the windvane?

The vane mast can be shortened by about 70 cm to suit a specific situation.

But just to state the obvious, the windvane still needs to get wind.

To reduce the height of the vane mast, the pushrod that runs inside the vane mast needs to be shortened. It comes in two pieces, to be glued by the customer. Best to leave that to be the last task, after assembly and installation.