Range of travel inconsistent

Device set up for opening and closing vertical blinds using bead chain.
The range is set with the blinds set perpendicular to the window pane in the fully open position.
The fully closed position is set when the blinds are all but parallell to the window pane.
Problem:
When opening and closing the blinds completly the range shifts so that it opens less ang closes «more» with every try.

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