Arm will not move

If you are finding that your arm does not move correctly it may be because the arm gear has been tightened too much during assembly causing the gear to jam.

You can fix this simply by loosening the arm gear until the arm moves freely.

In this video you can see that the arm gear is so tight that the arm will not move, it is then loosened by screwing anti-clockwise, and the upper arm gear is pulled slightly away from the body and then the arm moves freely.

  1. Loosen the upper arm gear screw as shown above
  2. Pull the upper arm gear outwards until it is sufficiently loose