HaLeivi and DaasYochid: Actually, the hetter of “mitoch” could be all- encompassing. If memory serves me right,originally “mitoch” was an absolute hetter and it was tosefos that insisted you need “zorech ketzas” (maybe de-rabbonon”. The hetter was based on the fact that once the Torah permitted a specific “melocho” on yom tov- for ochel nefesh- then that “melocho” was basically “muttor me-ikro” (think of the contrast of Tumoh dechyo or hutro). That is why tosefos has a “hava aminah” to allow building a house (as I said, it means fixing as building as building could have been done me’erev yom tov). And tosefos has to assume another de-rabbonon ,such as “uvdo dechol”. The avnei nezer is a chiddush-that only with an av melocho yo usay “mitoch” and I wonder whether it holds up in all manners.
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