From your description, it sounds like the shaft encoder on the central knob has failed. When you say the FlexControl does not move smoothly, are you saying that when turn turn the knob it is stiff to turn, or as you turn it you can feel something grating or perhaps as you turn, it feels as though you are driving over bumps?
If the feeling is something like the above and when you press the knob to activate the push function doesn't work, then it is a mechanical failure of the shaft encoder.
The shaft encoder is a mechanical device - if the FlexControl was dropped that could explain the failure.
Sorry you are having the problem.
It is a hardware problem the second case you are describing. It made me feel like; suddenly power steering turned off and becomes to 50 years ago manual steering. Apparently, the shaft encoder was broken, however, there has been no chance to drop nor had a chance to get an abnormal power. So, I raised a question - it is about one year old.
I tried plus/minus driver, square wrench (collins uses), hex wrench, but seemingly not fit....
The new one is on the way stopping at Memphis and will be available next week. So I want to repair the broken one with zero risk.
73 de JI1BNU
As I recall, several months a go there was an incident where a FlexControl suddenly malfunctioned. Several of the good folks on this forum jumped in with possible explanations of the problem and offers of help. About 24 hours after his original post the owner of the problem unit reported he had discovered the control knob was simply slipping on the shaft and he had repaired the problem.
Takeshi, your last post reminded me of this incident. I doubt the solution to your problem will turn out to be so simple. But while you are waiting for your replacement FlexControl, you might do a search of this forum and try and identify the writer of the post I refer to above. He could certainly answer your question concerning what kind of tool do you need.