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Watch a 3D CAD image of Self-Retaining Ball Plungers from Carr Lane Mfg. Co. Due to their self-retaining design, the press-fit ball plungers can be securely installed by hand in an ordinary drilled hole. The slotted end of the thermoplastic body expands to compensate for hole tolerances up to .008" oversize. A sturdy shoulder provides a fixed seating position and positively resists detent force. The installation hole can be counterbored to recess the shoulder.
