Thank you!
And yes, I was thinking of Tirick's figures but the graphic was faster.
Back to the mount problem.
I felt I was close to the solution but I did not know how I should proceed. In theory the idea was sound, it was exactly what I would do if it was a CG model. But this strange angle made every attempt impossible... - or not???
Let's think about what an intersection is. Simply put, two pieces of different shapes meet each other at a certain point. I had the shape of one piece of the equation and the meeting point. All that was missing was the shape of the second piece. But wait - isn't that the basic formula of a mathematic problem? Two variables which are known are combined in a way to reveal the value of a third variable that is unknown?
Then it struck me.
I remembered how the volume of a sphere was calculated and how the formula was proven - by cutting a sphere into a series of small cylinders of different diameters and adding them.
Now how is a tube constructed in the CG world?
It is made of a series of thin rectangles.
That gave me a clue and I swang into action.
I inserted the mockup mounting tube into the left side of the cockpit ball till it met the interior frame. I made sure that it was correctly aligned and tried not to touch it from now on.
Then I cut some left-over card to thin strips and began glueing them to the inside of the tube.
I started at the shortest point, continued with the neighbouring point, and went all the way round. I attached every strip so deep till it met the inner sphere.
This was the result:
The strips followed the shape of the interior frame exactly.
Now I cut open the tube and unrolled it:
This looked like the wavy line I needed. But would it be precise enough? A test mockup tube would show:
I pushed it in -

et voilà: It was straight! And it fit! YAY! :King:
Next I marked the length of the visible tube, traced the wavy line, added some flaps,
cut everything out and assembled the new arm tube. A final test showed: everything fitted!
PHEW - PROBLEM SOLVED!


