We have two Luders 36 photos - one with an Auto-helm, one with a Monitor.
Images of Monitor: 1
Images of Auto-helm: 1
Here's Bob Millen's 30-year old "Moonrise", with 30-year old Larwyck Monitor #130, leaving New Plymouth, New Zealand in 2007.
It's the old-style mounting system, but it clearly shows the common method of fitting the airvane mast on the upper mounting tubes.