| 摘要 |
A rigid fastener, for securing to one another adjacent portions of a cover member made of resiliently deformable material, has an end portion with an outward end section of relatively small outside diameter and an axially adjacent inward section of relatively large outside diameter. The end portion of the fastener is engagable in either of two positions in a corresponding recess formed into at least one of the adjacent portions of the cover piece, affording a high level of holding power in its filly inserted position and affording a low level of holding power in a partially inserted position.
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