Can you explain the mechanism in the arm? I understand from the pics you're using a ball joint (?) and a hinge, but what's the rest of it inside the bicep?

I have the same question as Na. I can't quite figure out how the white pearl bead is holding the arms in.

Beautiful sculpting as always.

Wow! Really well done. 

Can you explain the mechanism in the arm? I understand from the pics you're using a ball joint (?) and a hinge, but what's the rest of it inside the bicep?

Tomorrow I'm going to make the same joint for another character so I'll take step-by-step photos and explain how it works

I made this joint from what I had at studio in this moment ( sorry for possible English   mistakes   )
It will be a lot of photos
For each joint we'll need

4 split pins
2 nuts
1 plastic bead
1 bolt ( its diameter should be the same as hole in the split pin

materials


super glue
accelerator for super glue
thin metal wire

tools

I'm going to post only images of the process, please feel free to ask questions if something unclear