  We present the observations and the results of our experience from a large
number of flight hours in constructing, handling, testing, studying and
interacting with our Antikythera Mechanism functional reconstruction models. We
constructed our models according to the X Ray tomographies and without any use
of modern stabilization parts (screws, nuts etc). Simple typical bronze
material (not with special alloys) was used in the construction, while (most
of) the gears were cut from simple bronze discs with thickness about 2mm and
with triangular shaped teeth (not in modern involute shape). The bronze (not
iron or steel) shafts have dimensions conforming to the original parts of the
ancient artifact. The assembly of the parts was done following careful study of
the Personal Constructional Characteristics and the Design Style of the ancient
Craftsman, which are visible or even hidden on the Antikythera Mechanism
Fragments. During the extensive use of our models, it was concluded that two
important and mandatory indicators are missing from all current reconstructions
of the Antikythera Mechanism. The absence of these two indicator dials makes it
difficult to properly operate the Mechanism and their existence is necessary,
in order for the Antikythera Mechanism to be considered as a complete and self
contained operational time measuring device. The two procedures related to the
(poorly) preserved remains were located on gear b1 and the lost Cover Disc of
the b1 gear. The reconstruction of those missing parts was achieved by paying
special attention to the Personal Constructional Characteristics of the ancient
Craftsman. The extensive analysis of the Antikythera Mechanism calibrated
scales leads to the understanding of the Mechanism as a luni solar time
measuring device, as opposed to the notion that it was a mechanical planetarium
presenting the hypothesized planetary motions and positions.
