V Brake Stroke Converter, Folding Bike V Brake Tension Adapter Brake Cable Aluminum Alloy CNC Machining Caliper Regulator Tensioning Adjust Gear Modification Tool for Road Cycling

They look more intimidating then they are. The pulley does move a little, so it's important to keep everything taught and the housings fully seated when you're installing. I used these: https://www.amazon.com/dp/B0CBS7246Y/ref=twister_B0CBS7QZWV?_encoding=UTF8&th=1 And followed RJ the bike guy's video. https://youtu.be/IJEBRCWNC8g?si=CKZJvKoI98tlPOLM I find these easier, because they have built-in tension adjusters.