Funicular Poligon does some changes

Hi,

i've found this file! 

For my purpose i've to do some changes.

I want move the pole of the funicular poligon 

and meanwhile i move the pole the funicular 

poligon  and the catenary change their designs.

Now for does these change i can move the slider

Horizontal Force but i want that these vertical forces

are fixed and only the pole moves.

My purpose is to change also the closet string

of the catenary when i move the pole.

Thanks,Matteo.