sixto,

On springs that are mounted vertically, there should be an adjustment for the length of the wire that wraps around the wheel at the end of the spring. Decreasing the distance of the wire will increase the tension on the the spring. In some instances you can move the spring itself. Do you find that more effort is needed to lift up the door?

On springs that are mounted horizontally, you should be able to stick in a "helper bar" of some sort, and after loosening a set screw (more like a bolt), tighten the spring.

Hope this helps...

-Larry

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D