3-way diverter

small part inside the 3-way divertor valve in a Hudson Reed Tiamo thermostatic bar shower. The shower is discontinued by Hudson Reed and the 3-way divertor is back ordered for 3 months. So this little piece that grabs the handle shaft and locks onto the ceramic disk can break and the shower will no longer turn off. Note this is not the valve on the right side that controls the thermostat, it's on the left side that turns water off, or diverts to the shower or the sprayer.