Originally Posted by
jacksbike
similar to rapidfire springs and pawls, something is bad inside. I am quite sure it is not repairable.
Being as the rest is as you say is 'mint' that a little surprising, for the analogy to Rapidfire (+) you can often get these to work again, I recently had a shifter that would miss shifts, pulled it apart (no further then the main screws) flushed and re-greased, and it works fine now!