ok yes.. same principal. The rubber bits should stop the main tube from spinning round, as they will grip the inside of the bar. put it all back togehter again. Do the main bolt up till it's finger tight, then give it half a turn with the wrench. now.. insert the tube into the bar and tap it back down. DONT grease it up, else the rubber will slip and you'll be fooked till it dries out. once in, you should be able to tighten the bar-end side of the screw quite a bit, until it becomes very stiff. What you're doing is "clamping" that big bit of rubber together, which forces it to push out sideways against the inside of the handlebar. Once you've "clamped" it enough, the bar-end will be rock-solid in there..