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Reusing a Defunct Top-Loading Washing Machine by Converting It to Pedal Power - Step-by-step
Great project! One suggestion: You mentioned syringing water into the pipe to prime it. That seems like an annoying step - maybe holding the whole boat underwater with the tubes facing up until all the air bubbled out would be easier? You might end up with air trapped in the loop which could cause problems though. Hard to say without testing it!