| 摘要 |
A device having an elongated member, a head having a passage for receiving one end of the member and means coupling the head with the opposite end of the member with the latter being movable into and out of the head. The head has improved means to releasably lock the end of the member therein, such means including a pair of relatively shiftable members normally in engagement with each other and movable apart to present an access passage therebetween. A number of embodiments of the device are disclosed.
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