Thanks also to you for the suggestions and ideas. Really great, this forum, for these kind of issues
I the mean time please know I used the springs as on DarNico which I visited earlier last year searching for my SM
It is simple and easy.
It works now fine with me too. Maybe an extra sliding lock pin on top later but for now will try this.
See also the message I send to DarNico with the photos
Far winds and safe sailing