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A small (no, really... small) electric vacuum pump would provide a better backup solution, as it wouldn't involve drag on your coast, and only draw a very small bit from the battery, not enough to bother anything.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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