Broad brush painting is quicker. And if one is not at hand? In this case, it will help out the spark of two narrow. If the workload is small — they can simply attach sideways to each other with tape. For long work better to seal them together using thin strips (for example, a school ruler), as shown in the figure.
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AA cells can be installed in a socket of larger diameter than itself, if you wrap it in several layers of paper, foam or any other available material suitable for this purpose. For...
