Good info and I guess they all vary, 'cause mine only had the snap ring holding the compressor housing to the center section and the clocking was ground off or something, cause it can be orientated any way of 360 degrees (the exhaust turbine side has the key nipple still)
If you pull the shaft out, be careful when you put it back in, as it's really easy to score the bearing(s) inside and a pain to get it to 'lock' back in (mine was, at least).
However, if you can avoid pulling the wheel off, do that, IMO, to avoid any potential headaches of not re-aligning (for balnce), etc.