I have a really stupid question. I have seen the term "cable ratchet" many times in this thread. I really want to know what exactly is cable ratchet? Is it the shift cable housing that come out horizontally from the brifter? Do i have to take the cable out or just the cable housing out in order to blast WD-40? How can i take the cable or cable housing out from the brifter??

Also, if you blast WD-40 and then lube to the cable ratchet, the brifter will be filled with those liquid. Will those WD-40 and lube go down to the bar tape? and soak the bar tape?? Or i have to take the brifter out from the bike before i do that?

I know these are really basic. I as well have a RSX 7-speed drivetrain that i may need to service later.

Thanks!!