is it the left or right one ? if it the left one line the mark and the no.1 up together then push and it should snap back together.if it the right one line the mark up to the highest number 5,6 , 7, or 8 and again push and it too should snap together. if this does work then the shifter need replacing. there should be a spacer than goes between the shifter and the grips. the grips should keeps everything together for you .