Hello everyone! I am making an articulated action figure of a character in ZBrush & SpaceClaim(For Engineering). I was going to cast his main torso out of hard plastic(similar to ABS) and his limbs out of a polymer resin where its like hard rubber and semi flexible. I'm trying to figure out how to cast the polymer resin around a hard plastic hinge disk for the shoulders so his arms can swivel outward. When I cast around the disk, the polymer will go through the disk hole in the middle creating a "Hidden Pin". I know I have to mold and cast the hinge disk first and then insert it into the other mold to cast around it, but I'm not sure how to set the shoulder mold first so there is a spot to insert the disk hinge into the mold to cast around it. The two part casting for the shoulder is what I'm talking about. I'm also having trouble figure out how to mold the inside mushroom hole inside the bicep so the shoulder can pop into it.Help would be much appreciated! Thanks a lot!