Cable Car (Teleférico)
Advice: Start the slide with a smooth move of the throwing hand towards the center. Try different heights for the non-throwing hand. The higher it is the bigger the initial impulse needed for the top to slide on the string. You can also change the position of the other (throwing) hand at the time the backward walk begins. Adjust it so the string is more or less perpendicular to the top.
Notes: The string can be wrapped around the tip by going under or over the spintop. The first version seems to be more common but the difficulty is similar.
The top slides on the string while "grinding" (against the top rotation).
History/Etymology: This trick was (re?-) introduced to the U.S. spintop community in 2005 through the first Colombian video posted on this site (and I included it in my nats 05 freestyle). Gerardo Montero from Mexico tells me that he has been doing the trick since around 2000.
Both in Mexico and Colombia the trick is called "teleférico". The literal translation is "aerial tramway," of the type used in mountains; what the British call "cable car" (not the American "street tramway" meaning). The name is obviously very descriptive. An alternative name in Mexico is "escalera eléctrica".