A replacement head-kit for Transformers: Combiner Wars figures and others that use a 4mm ball joint at the neck. This includes Combiner Wars Swindle, Hound, Rook, Prowl and others.
Some fine details may not show up clearly on prints in strong & flexible plastic.
Use a toothpick or pin to remove any support material inside the connector ports on the back of the face.
Paint and seal as desired. Detail plastic prints will need a light washing with soap and water prior to painting to remove support material residue.
Use a small 3-4 mm long watch screw to connect the head parts around the ball joint. Some sanding or gluing may be required.
The port does not come pre-threaded, so the initial installation will be tight. If the screw connection is too loose you can secure it with a drop of superglue inside the port prior to reinstalling the screw.