I made the mistake of not checking how to change the gear cable on my 2010ish X9 shifters and took the thumb shifter off.

What a nightmare getting it all back together, I won’t be doing that again in a hurry 😥

not sure if they’ve changed much in the last few years (doubt it) but this can be very handy: http://www.ridemonkey.com/forums/f5/2008-sram-x9-shifter-206672/

I had to do it recently as it Jammed up with a single broken strand of gear cable that unravelled up into the shifter. Wasn’t too bad but I was ultra careful not to disassemble the internal mechanism for that very reason. I did a surgical style operation with the wire cutters to free up the mechanism and clear out the cable. Much easier to change a cable via the proper way!