Split mold insert and a mold incorporating same

A mold stack comprising:

• a core insert configured to define, in use, a first portion of a molding cavity;
• a cavity insert configured to define, in use, a second portion of the molding cavity;
• a gate insert configured to define, in use, a third portion of the molding cavity;
• a split mold insert pair configured to define, in use, a fourth portion of the molding cavity, the split mold insert pair comprising a first split mold insert and a second split mold insert, each having:
• a body having (i) a cavity defining portion for defining, in use, a portion of a neck area and (ii) a top projecting portion and a bottom projecting portion located at opposite sides of the body;
• a first female taper portion associated with the top projecting portion defined on the cavity defining portion face thereof;
• a second female taper portion associated with the bottom projecting portion defined on the cavity defining portion face thereof;
• the first female taper portion and the second female taper portion for cooperating, in use, with a first male taper associated with the cavity insert and a second male taper of the core insert, respectively, for performing exclusively aligning function thereby aligning the body into an operational configuration.