| 摘要 |
A bushing holder unit includes a cap holder unit including a cap holder in which a cap portion of a spark plug connector is fit, and a magnetizable portion by which the cap holder unit may be magnetically fixed. A magnetic fixing mechanism magnetically fixes and releases the magnetizable portion of the cap holder unit, and includes a shift guide that provides free axial movement of a bushing stem of a spark plug connector. An axial guide prevents lateral movement of a bushing of a spark plug connector but provides free axial movement of the bushing along the axial direction. A bushing holder receives the bushing, and includes a threshold plate with a measuring threshold surface that receives a connecting rim of the bushing. A thrust mechanism moves the cap holder unit along the axial direction, so that the connecting rim of the bushing contacts the measuring threshold surface.
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