(57) The fastening and adjusting device includes a pair of upwardly hinged rods (2,3),
a U-shaped element (6) is hinged at the lower end of at least one of the rods; the
lower end has a substantially rounded surface (10) and the U-shaped element defines
a cavity between its legs (7) and the same surface; a support member (11,14) can be
inserted in the cavity and can be locked against the surface by means of an adjustable
abutment means (9); the support member (11,14) is adapted to support a lead holder
(13), a drawing pen (12), a point, or similar.
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