My coupler just disintegrated too. The while you're in there is to replace the cup bushing and shaft bushing that are accessed by removing the shifter housing- very easy to do.
There are also several different coupler choices- I bought the Stomski and it is a work of art. I still need to adjust it, but initial shifting felt good. You can see the other two bushings and the Stomski in this picture of my mess.
