Hi Ron
Watch it. Drawing 17 is to scale, meaning 1 :1. The sort of sketch is a JPG file and not to scale.
The wooden "eye" is only an example. You can also use a bull's eye on each side.
The angle is automatic determined by the position of the plastic tupe and the distance of the rudder
to the lower corner of the rudder housing. It is a triangulation ;-))
Cheers
Bernd
?
Bernd Kohler