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Rav Belsky, shlit"a, explicitly declares his reasoning in the letter: ...a tiny possibility of ספק is introduced so that the odds of the melocho being completed is reduced somewhat or delayed minimally. This concept has no place in Halacha. My understanding is that his reasoning is not that different from the general principle that we are not concerned ...
He also signed on this letter, which allows for grama devices in hospitals.
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