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Problem solved, thanx to you guys!

Thanx! There are different kinds. I’m building a reversible aerial tramway; they travel along one or two wires, pulled by a third one driven by a motorized drive wheel at the mountain station. Classic James Bond fight scene setting by the way:) http://en.wikipedia.org/wiki/File:PortlandTramCar3.jpg

Great! So, is that a Lego hose?

Dear all! I have a construction issue that someone might be able to help me with ... In the first picture below, one of the two cabins on my Lego aerial tramway. They travel along two wires (nylon rope 0.7 mm) on wheels (currently model 42610). These wires need to be supported by a tower along the way, and the challenge is to construct "saddles" for each side of the tower that can support cables while allowing for the cabins to slide over - without falling off. I have temporarily solved this with a wooden structure, but it is supposed to be all Lego in the end, right:) Below a picture of how these saddles usually look irl. Perhaps I can build something similar, but I have no clue what parts to use. Perhaps there is some sort of thin tube in the range that I can attach to the saddle, and let the nylon cords run through it and the cabin slide on top? Tricky ...All ideas are more than welcome, also entirely different solutions all the way:) Best! //E

Thank you, interesting! Something like this? http://www.sheepo.es/2011/09/continuously-variable-transmission-cvt.html

I have a Lego Power Functions M-motor with infrared receiver and remote control. For my project, I would need to be able to regulate the engine speed fully continuously for smooth acceleration (and not in 7 fixed steps). How do I achieve this in the simplest possible way? I’m open to all solutions, not necessarily a wireless one.