Disclosed is a guide element, for supporting and guiding a pin (P) of a glyph in a slot along a sliding direction. The guide element includes a central body (10) provided with a seat adapted to house a portion of the pin (P) and at least one lateral portion (10, 30) which has a sliding surface (21, 31) adapted to slide in contact with a respective lateral wall of the slot. The central body (10) and the at least one lateral portion (20, 30) are configured to rotate relative to each other about an axis (X) parallel to the sliding direction.