Wastegate Diaphragm R&R--stuck nut!

[Motor Sport Visions Photography]

I tried and tried, but couldn't get that wastegate diaphragm upper nut
removed yesterday afternoon. I have started to remove the wastegate, but
put off finishing 'till this afternoon since darkness was setting in
last night.

I have already searched the archives, visited Scott's site, and tried
the screwdriver trick. Anyway, I thought I would bounce this off the
list to be sure I am heading in the right direction.

I assume that once I get the WG off I can access something on the bottom
of that shaft (hex? slotted?) to lock and turn against to remove that
top nut? It has all soaked in PB Blaster and Kroil overnight--which may
help. Anyway, I have managed to remove the four nuts that hold the WG to
the EM already. I can see the three bolts that secure the WG to the
downpipe and think I can get to them (and I can also see that I will
need help holding/turning from the top while I'm underneath--my wife has
already been warned ;-)...). Once I get those three bolts removed, will
the WG come out? (Looks so...but I wanted to be sure having no BTDT in
this area of the car yet).

Any and all BTDT advice will be greatly appreciated. TIA!

Mike Veglia
Motor Sport Visions Photography
http://www.motorsportvisions.com