Your shop should be able to help you with this. If not, order these
https://www.ebay.com/itm/20-40pcs-Bi.../303238337631?
Undo the brake cable and thread these onto it between the cable stops. If you have an internally routed cable, which I think you might, it gets more complicated than I can help you with "virtually". Sorry
Mark Petry
Bainbridge Island, WA USA