Ty for the answer.
Yes i finally did that too, i unscrew one million and one screws then gently removed the rubber band where my faulty C key was, blow some air, clean a bit and put it back togther: worked !
I did it twice actually cause after the first time i got a velocity problem on another C key, so 2 million screws to unscrew 
Actually i’m so glad this hardware is that straightforward, okay theres a lot of screw but nothing fancy.
Love this design.
Again thanks for your input
Cheers
Q.
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