Introducing Glassblowing Tools
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Jacks consist of two metal blades joined by a spring-like handle. The distance between the arms is controlled by the glassworker, who uses jacks for a variety of purposes while shaping the parison (for example, to form the mouths of open vessels). Depending on the angle at which the blades are held, jacks can be used to: shape the vessel as it is being inflated, create a constriction to help separate the glass from the blowpipe, or flare the opening of a vessel. The glassworker controls the distance between the blades to change the shape of the glass as it is rotating.
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