Thanks everyone for the prompt responses. Kelly from the Reef Shoppe e-mailed me back within minutes (Top notch customer service!) and walked me through some disassembly step via e-mail.
Turns out I haven't been thorough enough with my cleanings - the impeller magnet had actually fused to the central pin it's supposed to spin around. I thought the pin and the magnet were one piece and the pin was supposed to spin as well, but I was sitting there scratching my head wondering how the pin was supposed to rotate when it was anchored with such snug rubber fittings.
Chalk that up to me being an idiot.
Again, can't say enough about Kelly's response.
+1 reef shoppe
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