replacement of parts on devo 12 s

Hello every body,
I would like to replace a rotating knob (chanel Aux 6) that has a lot of play.
I don't know how to separate the knob from the unscewed block which supports the chanel 5 (gear) etc etc.
On the knob I can see a little hole but so tiny I cant insert any tool.
Does some know how to proceed?
Thank U for your helpfull answer
Have a nice day
Thierry

Hi!

The knob is held in place by a setscrew located in this tiny hole you mentioned.
A 0.89mm hex driver is the right size to handle this setscrew.

Max

Thank U for your kind and helpfull answer.
Thierry