The steel used to manufacture Bertolini’s church chairs is mandrel-bent resulting in a more attractive, secure, and stronger bend. Many church chair makers form their frames using crush bending, a technique that weakens the frame and leaves an unattractive indentation. In contrast mandrel bending places an insert (a mandrel) into the tube when the bend is made to prevent collapsing. While this may not be quite as fast or as easy as crush bending, it results in a superior bend that maintains the full integrity of the steel tubing–the exact reason NASCAR mandates this type of bend for tubing used in safety cages on all race cars.
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