The bottom side of the line plate shall be cleaned up (no oil stains), and all the screw holes on the plate shall be tapped with screw taps.
线条板底侧面清洁干净(不能有油污)，板上螺丝孔全部用丝攻攻牙一次。
A circular hoop sheet is punched with a spiral line, and one end of the spiral line penetrates through the connecting piece to contact a bottom plate to engage with the screw.
圆形箍片冲制有螺线一端穿过连接件贴靠在底平面并与螺钉相啮合。
A circular hoop sheet is punched with a spiral line, and one end of the spiral line penetrates through the connecting piece to contact a bottom plate to engage with the screw.
圆形箍片冲制有螺线一端穿过连接件贴靠在底平面并与螺钉相啮合。
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