Fine sand cloth or emery cloth may also be used with the same precautions.
细砂布或金刚砂布也可以使用，但同样要小心。
Use sand cloth lighting, want to use "the hands clip", in case the tools such as ground injury.
用砂布打光工件，要用“手夹”等工具，以防绞伤。
Use sand cloth or steel wire brush to clean both tube and cup to a bright metal. Steel wool is not recommended.
采用砂布或钢丝刷清除管道和端口，使其显露出光洁的金属色。不建议采用钢丝棉。
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