Thanks for the replies, everyone.
I filled a bucket with water, mounted the pump using the magnets, and plugged it in. For the first 10-15 seconds, it made that same screeching noise... and then it abruptly went silent - dead silent! I had to put my hand in front to ensure it was still running. It's moving water, and making no sound at all. SUCCESS!
Thanks again for your input!
Dave
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