Patent ID: 8353193

Claim:
An installation system for expanding an opening in a workpiece, the installation system comprising: a mandrel assembly receivable by an installation tool, the mandrel assembly including: a rod having an engagement section for coupling to the installation tool and a substantially non-tapered section, the rod including a head section distal to the non-tapered section; and an outer member movable along the rod between a first position and a second position, the outer member having a collapsed configuration for passing through the opening of the workpiece when in the first position and having an expanded configuration for expanding the opening of the workpiece when in the second position, the outer member surrounding and engaging the non-tapered section when in the second position, the outer member positioned on the rod between the head section and the rod engagement section so that axial movement of the outer member along the rod away from the engagement section of the rod is limited by the head section of the rod.