Nothing needs driving out. (this is from memory so someone correct me if I am wrong) Rotate the gear until the oil hole is over the thing you call a small wedge. Poke something down the hole to depress a small plunger that locates in a hole in the "wedge". You will then be able to slide the wedge out, and then rotate the thrust washer to align with the splines and it will all come apart. Keep an eye open for the plunger and spring.
Mart.