Secondary Shaft & Electronic Plate Assembly
After the upper circlip is removed, the upside down "dish" can be removed by holding the assembly and tapping the top of the shaft with a plastic faced hammer. Do so with the opening of the dish located at the sensor as shown to prevent any damage to these parts
It is best to spray the exposed end of the shaft with Liquid Wrench and let it sit overnight because corrosion could have formed between the parts. And even at that, it took a few dozen taps with the plastic faced hammer to get it to slide off.
Do not lose the small locating pin. If you do, it is 2.15 mm in diameter and 4.75 mm long. The shank from a number 44 or 45 drill bit cut to length would work.