Completing the turning mechanism

Step 1 Using a split pin attach the syringe controlling the hinge attachment, as shown on the right. Place a drop of glue at the point where the split pin wraps around the tubing of the syringe.
Click to see the complete attachment.

Step 2  Pass the tubes connected to the two syringes controlling the jaw and the arm through the spacer tube at the bottom of the body, under the base and out through the holes on the side of the base.

Only fill the tubes with water at the very end when the model is complete.

The complete hydraulic device.