can't remove rear hiehgt adjuster on honda lawnmower

I have Honda lawnmower HRR 216 2SDA MZCG-7153007, with a broken rear height adjuster (1 wheel adjust). I can take the wheel assembly apart, but can't, for-the-life-of-me, get the adjuster assembly off. There seems to be something holding the assembly, on the axial, from inside the mower deck. Please help!:ashamed: