As I was riding to bike night last night I noticed that my shift lever "dropped", as in lost all tension. To shift I had to flick the lever up and then down quickly to get it into gear. The linkage is all there, and tight. A friend of mine told me that it feels like a tension spring/spline/holder on the other side of the case either broke or fell off. Does this make sense to anyone? Has anyone had this happen before? Easy fix? Something I could do myself?