I'd like to know this as well. I pulled the piston unit out because it just kept binding up. When I did pull it out I saw it was all scratched up. I tried cleaning it and putting it back together, but it kept binding, the piston always got cockeyed and stuck no matter what I did. But if I could put a fan unit in mine, that would be great as then I'd get synchronized smoke with sound since I put a DCC decoder in it.
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