Assembling a heat exchanger.
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Previously:
https://www.homemadetools.net/forum/...890#post217155
https://www.homemadetools.net/forum/...794#post198257
https://www.homemadetools.net/forum/...005#post230037
https://www.homemadetools.net/forum/...044#post226949
https://www.homemadetools.net/forum/...883#post183588
