Mirror problem

[Dalek]

My rear view mirror shakes badly when driving.
It is well stuck to the windscreen so it is not an issue there. Is there a way of tightening the joint where the mirror housing is joined to the arm (the large ball where the mirror swivels for adjusting?

 

[hard top]

This thread could possibly be of some help ?

Link :-

https://zroadster.org/threads/rear-view-mirror-fastening-loctite-319.36995/