各接地连接点应加弹簧垫片，连接紧固可靠。
Spring gaskets should be added to the ground points, and the connection should be fastened.
平垫片和弹簧垫片，它们安装在防退膨胀管和螺栓六角帽之间的螺杆上；
The flat gasket and the spring gaskets are arranged on the bolt between the ante-receding expansion pipe and the hexagonal cap of the bolt.
利用戳柄内弹簧和戳颈垫片，使之在操作时具有缓冲功能，以适应不同状态的被盖物。
The nail type signet has buffering function by making use of the inner spring of a signet handle and the shim of a signet neck to adapt the stamped objects of different states.
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