V8 rear caliper repair question #2

[Tony Lum]

Hi gang,

I'm in need of further help on a V8 rear caliper rebuild.  I managed to 
pull the snap ring that locks the spring loaded collar surrounding the 
helical threaded center post, but now I'm stuck again.  There looks to be 
another plate with 3 holes and a alignment notch that sits below the snap 
ring.  Does this unscrew or need to be removed?  I feel like I'm 
dismantling a bomb fuse.  I hope I don't need to make another special tool 
to take this thing apart!  I might mention that the parking brake cable arm 
is almost frozen.  It will move, but only under very high pressure.

TIA,

- Tony
lots of I-5 Audis