Quote:
Originally Posted by Flit
I don't think you are supposed to be able to move the outer ring. All calculations are reached by moving the middle ring only and by comparing readings between the outer middle vs the outer ring and the inner middle ring vs the inner ring. The construction of the 'zielkurswinkel' is made of two pieces and a groove has been machined into it to fit the middle ring, the second piece.
I think, lol. 
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oh dear I didn t know that. I just use it too look at it