A method of producing an assembly tool, the assembly tool being for assembling an assembly comprising one or more components, the method comprising: providing an upper portion of a jig frame; fixing one or more support plates to the upper portion of the jig frame; machining the one or more support plates such that a surface of each of the support plates lies in a common plane; positioning the upper portion of the jig frame such that the surfaces of the support plates that lie in the common plane are in contact with a supporting surface; fixing one or more pickup device mounting plates (140a, 140b) to the upper portion of the jig frame; machining each of the pickup device mounting plates (140a, 140b) such that a pickup device receiving surface of that pickup device mounting plate (140a, 140b) is flat, horizontal and at a predetermined height above the supporting surface; fixing, to the pickup device receiving surface of each of the pickup device mounting plates (140a, 140b), a respective pickup device, each pickup device having a receiving element for receiving a component of the assembly; and wherein the method further comprises: providing a lower portion of the jig frame; fixing one or more further support plates to the lower portion of the jig frame; machining the one or more further support plates such that a surface of each of the further support plates lies in a further common plane; positioning the lower portion of the jig frame such that the surfaces of the further support plates that lie in the further common plane are in contact with the supporting surface; fixing one or more further pickup device mounting plates to the lower portion of the jig frame; machining each of the pickup device mounting plates (140a, 140b) such that a pickup device receiving surface of that pickup device mounting plate (140a, 140b) is flat, horizontal and at a predetermined height above the supporting surface; fixing, to the pickup device receiving surface of each of the further pickup device mounting plates, a respective further pickup device, each further pickup device having a receiving element for receiving a component of the assembly; and attaching the lower portion of the jig frame to the upper portion of the jig frame. providing an upper portion of a jig frame; fixing one or more support plates to the upper portion of the jig frame; machining the one or more support plates such that a surface of each of the support plates lies in a common plane; positioning the upper portion of the jig frame such that the surfaces of the support plates that lie in the common plane are in contact with a supporting surface; fixing one or more pickup device mounting plates (140a, 140b) to the upper portion of the jig frame; machining each of the pickup device mounting plates (140a, 140b) such that a pickup device receiving surface of that pickup device mounting plate (140a, 140b) is flat, horizontal and at a predetermined height above the supporting surface; fixing, to the pickup device receiving surface of each of the pickup device mounting plates (140a, 140b), a respective pickup device, each pickup device having a receiving element for receiving a component of the assembly; and wherein the method further comprises: providing a lower portion of the jig frame; fixing one or more further support plates to the lower portion of the jig frame; machining the one or more further support plates such that a surface of each of the further support plates lies in a further common plane; positioning the lower portion of the jig frame such that the surfaces of the further support plates that lie in the further common plane are in contact with the supporting surface; fixing one or more further pickup device mounting plates to the lower portion of the jig frame; machining each of the pickup device mounting plates (140a, 140b) such that a pickup device receiving surface of that pickup device mounting plate (140a, 140b) is flat, horizontal and at a predetermined height above the supporting surface; fixing, to the pickup device receiving surface of each of the further pickup device mounting plates, a respective further pickup device, each further pickup device having a receiving element for receiving a component of the assembly; and attaching the lower portion of the jig frame to the upper portion of the jig frame. providing a lower portion of the jig frame; fixing one or more further support plates to the lower portion of the jig frame; machining the one or more further support plates such that a surface of each of the further support plates lies in a further common plane; positioning the lower portion of the jig frame such that the surfaces of the further support plates that lie in the further common plane are in contact with the supporting surface; fixing one or more further pickup device mounting plates to the lower portion of the jig frame; machining each of the pickup device mounting plates (140a, 140b) such that a pickup device receiving surface of that pickup device mounting plate (140a, 140b) is flat, horizontal and at a predetermined height above the supporting surface; fixing, to the pickup device receiving surface of each of the further pickup device mounting plates, a respective further pickup device, each further pickup device having a receiving element for receiving a component of the assembly; and attaching the lower portion of the jig frame to the upper portion of the jig frame.