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Aha! Took me a little while to figure that out, but then it hit me that the shallow “v” and the two decorative holes together formed a “Y” shape, which fit perfectly over the 3prongs. Thanks.

I forgot that I have one of these tools, seeing your pics reminded me and reminded me of a question I’ve never had answered. - do you have any idea what the shallow “v” in the handle is for ? And...