WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Push out the pinion shaft component from the valve housing as shown.
NOTE:
If the pinion shaft does not come out easily, remove it using a press.
Fig 1: Pushing Out Pinion Shaft Component From Valve Housing