I apologize if this has been gone over before, but after several searches I'm still left with this question: I'm retrofitting a 1984 Peugeot with some ebay campagnolo super record and have been unable to get the downtube friction shifter to work for the rear derailleuer. All the washers etc. are there, but it appears that the two dish-shaped washers have been flattened out a little by over-tightening the wing nut. I cannot get this shifter to hold a gear and it is wobbly on the brazed lug - like its not tightened down. Can these washers be replaced? Has anyone else had this problem?