Reynolds公司经由对罐盖直径的改良后，又改造了拉环：采用5182 号铝合金板材制造的支持管盖(Stayon-Tub,SOT)。而后，该公司取得了生产制造这种新罐盖的允许证。
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轻轻旋紧管盖，在最大速度下离心1 min。
Close the lid gently, and centrifuge at full speed for 1 min.
有密封盖的塑料管比玻璃管好，因为它们更轻，而且如果处理不当也不容易破裂。
Plastic tubes with secure tops are better than glass because they are lighter, and do not break as easily if mishandled.
滤光镜，电极，晶体管，液晶体本身以层状放置在一片薄玻璃板上，上面还盖着另外一片玻璃板，这类似于三明治的结构。
Layers of material which work as filters, electrodes, transistors and the liquid crystal itself are deposited onto a thin glass plate to form a sandwich that is covered with another pane of glass.
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