DY: If you assume that Gramas actually work (like R’ Neuwirth did) it’s not at all completely clear that this is Assur. Now, almost no one assumes like he did, because we say anything made to work Al Y’dei Grama can’t be called a Grama. This is just a slightly more extreme application of the Shabbos Switch (or it would be, if it existed; since it doesn’t, it’s irrelevant).
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