Aspire ET-S Replacement Tank Bottoms

Is it possible to get replacement bottoms for the ET-S BDC tanks? I have 3 of the tanks and I bored some holes in them to loosen up the draw a little. I think I may have only needed to enlarge one of the holes as vapor production seems to be down along with taste. It also feels a little to airy as the tank isn't nearly as quiet anymore. Please tell me there's replacements I can get so that I don't have to repurchase all 3 tanks.
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