A Braille pin has three parts sharing a common longitudinal axis. A first part
has a first breath and includes a rounded tip felt by a user. A second part has
a noncircular transverse cross-section and has a breadth greater than the first
breadth. A first shoulder is formed by the juncture of the first and second parts.
A third part has a third breadth less than the second breadth. A second shoulder
is formed at the juncture of the second and third parts. A pinhole has first, second,
and third sections that respectively receive the first, second and third parts
of the pin. The first shoulder limits upward pin travel by abutting an overhang
at the juncture of the first and second pinhole sections. The second shoulder limits
downward pin travel by abutting a step at the juncture of the second and third
pinhole sections.
