ISTM that, if you want to relocate a particular module on head #1, you would need to edit both copies of RESF on head #1 so that they point to the new location. However, you would then need to be concerned about potentially damaging those existing modules by rewriting them with different microjogs. ISTR that @pepe mentioned the possibility of corrupting the SA with donor heads, but he didn't provide any explanation. But maybe that's a red herring?

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A backup a day keeps DR away.