The batteries that last me the longest are the Panasonic from the Dollar Store Followed by Duracell. I last about 3-4 hours with Echos fan system.
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The vocoder are part of the helmet's faceplate. You won't be able to find loose, unless you're lucky and can find an old FX or AM vocoder that are separated from the faceplate.
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Yeah, sand it down. I tried zap a gap for the first and last time today. The only way that it worked for me was a high grit sandpaper
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