bionic_radical wrote:how do you pop them and switch them? is there a link somewhere?
When I did mine I followed a basic tutorial by 1987olds442 at Transtopia. I've just found it again and although the pictures are no longer up here's the instructions.
Shoulders
1. I unscrewed the the two screws in the back of the upper torso.
2. Take the srews out of the shoulders.
3. Remove Shoulder covers & slide arms off.
4. Knock out the pins that hold the shoulders in place.
5. Swap the should base assemblies.
6. Swap the upper arm pieces.
7. Re-assemble.
Neck
The black tabs are easy, but also a pain..
1. Knock the pin out of the back piece then remove.
2. Knock the pins out of the tabs (the pain part).
3. Swap tabs.
4. Re-assemble.
I'll post some pictures of mine shortly to give you an idea how it comes out.
edit -
robot mode

close up on shoulders

rear view

dino mode, note that the screws will now be forward facing in this mode

A few points to note. The screws on this sucker are REALLY tight, if you take a crack at this be careful not to gouge the heads. I did end up scarring the plastic around the screws slightly when I had to switch to a larger than ideal screwdriver for better purchase, take care. You can't just swap the shoulder covers as each side is matched to the upper arm assembly beneath so you do need to do a full tear down of the upper arms.