Riobel TSYTM45 Shower Cartridge Replacement

Why did I shoot it vertically you may ask? Well because at this very moment you are in your shower cursing about the cartridge with a wrench in one hand and your phone in the other. Let's be honest - you haven't watched a video in advance of this project on your laptop - you are desperately searching on your phone in real time and somehow ended up here. So vertical it is!