This must have tool solves all of this. Universal gauge for easy identification of tap inserts. Range: RC1 - RC6.
Ideal Standard tap head drive insert 20 spline adaptor or spacer
2 Ideal Standard bath basin tap head parts Cover Drive Insert 18 spline +screws
Ideal Standard bath basin tap head parts Cover Drive Insert 18 spline E960053NU
Tap Valve Cartridge Basin Mixer Ceramic Spares Quarter Turn 24 Teeth Spline 1/2"
Thermostatic Shower Mixer Valve Cartridge Spline Extender Adapter Brass Spindle
Tap Valve Diverter Spline Adapters Spreader Pegler Comap 1 L05