if you would like to adjust the accuracy of this
movement, you have to pull- out the pin which locks
which holding the balance spring in place. Unfortunately,
the pin of this old movement was lost before I purchased
it for HK$ 30.
The PIN is look like the one in a mechanical
clock but much smaller.
Red ellipse - Pin on a mechanical
This photo shows the balance wheel with the balance
On the right hand side, it is the plate over
the balance wheel.
You can see there is a hole on the metal cube,
this hole is for the Pin mentioned above and the
diameter of it is about 0.02 mm.
This is my first time making a small part, the
Pin; therefore, it only last for about 3 minutes,
just enough for me to record a movie.
Although the movement can operate, it is not
stable. You can see, through the photo, the distance
between each circle of the balance spring is not
even, this is one of the problem.
Moreover, the plane of the balance spring is
not level ( not shown ).
All these problems make the movement unstable