When all else fails, I remove the screw and barend weight, take a very small steel rod that I have, don't know where I got it or what it was before, slide the rod between the handelbar & the rubber sleave, to break the suction, I bent one end of the rod down, slide it into the hole that the screw was in, and pull, and cuss until it comes out. Take a telescopic magnet and fish the nut out of the handlebars.