Replaceable internal cable stopper used on Ridley Noah, Noah SL, Fenix SL framesets for mechanical groupsets
Part number 3 in image.
For further information please refer to Ridley Frame Passports:
https://www.ridley-bikes.com/wp-content/uploads/2019/10/Noah-SL-Disc.pdf
https://www.ridley-bikes.com/wp-content/uploads/2019/10/Noah-SL.pdf
https://www.ridley-bikes.com/wp-content/uploads/2019/10/Noah.pdf
https://www.ridley-bikes.com/wp-content/uploads/2019/10/Fenix-SL.pdf
https://www.ridley-bikes.com/wp-content/uploads/2019/10/Fenix-SL-Disc-2018.pdf