先将废圆珠笔芯截成比 小药瓶长６～１０毫米的一段， 再在小药瓶底部和瓶盖的中心处各钻一个与圆珠笔芯粗细相同的孔，在小药瓶的周围钻许多直径约两毫米的小孔，然后将圆珠笔芯穿入小药瓶，两端露出３～５毫米，一端用防水胶粘牢即可（见图）。 使用时瓶内装入铁块或石子，还 The first waste ballpoint pen core cut into smaller than the length of 6 to 10 mm bottle, and then at the bottom of the vial and the center of the bottle each drill a ballpoint pen with the same thickness of the hole around the small bottle drilled many Diameter of about two millimeters of holes, then the ball-point pen into the small bottle, both ends exposed 3 to 5 mm, one end of the waterproof glue can be firmly (see photo). When using the bottle into the iron or stone, also