Originally Posted by Psimet2001

That's the common failure. I have a theory that it has to do with how the limit screw and tension are set. If you're at the high end and go for 1 more gear and it doesn't bypass and stay in the large cog but instead stops and jumps down a cog then there is too much hard stop/tension at that end of the travel - and I feel that it puts the critical parts under too much tension and causes the failure. Many, many of their shifters have run into this issue and many people have gone through multiple versions, yet - some that are set up by some mechs just never seem to have that failure. That's where I am starting to think that it has to do with how the mech sets the stop and tension.