I have heard that there is a fine tune function with the wheeltop EDS TX system. Something like holding buttons on both side for 3 seconds however I am not sure what that then does. Has anyone heard of this and knows how it works?
Here is manual
https://cdn.shopify.com/s/files/1/0589/9655/5828/files/EDS-TX_instructions.pdf?v=1707117217Page 45
First, an important point: this is the initial setting, i.e. moving the derailleur relative to the entire cassette.
The second important point: The buttons have two "pressed" positions. The first - after touching but without a click - it apparently turns on the electronics and prepares to receive a command. And the second - a click - is the actual command to switch.
1. Press the small button in the first, without a click, position (see above). Hold for 5 seconds.
2. The green LED on the derailleur will light up.
3. Within 3 seconds after this, press the small button 5 times in a row. Also, without clicking.
4. The blue LED on the derailleur will light up. This means you have entered the mode.
5. Adjust the derailleur by pressing the buttons all the way, with a click. Everything is intuitive here, as with shifting: the small button moves outward, the large one - inward. The step (according to the instructions) is 0.2 mm.
6. Exit the mode by holding the button on the left handle for more than 3 seconds.