I'm looking at a parts list/assembly drawing for an older 5C.
I don't see any real tricks although it is difficult to see in great detail. By the term , "brass block", do you mean the worm gear?
In my guesstimation, I think you'll have to remove the worm first. If you've got the motor off, and the coupling off, that should clear all obstruction on that end of the worm shaft. Then you can perhaps just pull the shaft out the other side, causing the spindle to roll as you do so.
Then, you might be able to take the spindle out and have the whole mess fall apart on you
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)