You could ask them to come back in, sign the correct spot, cross out the incorrect signature and initial the cross out. That might afford some protection. But really...if you've done ROR incorrectly, there's really no sure fire way to correct it in my opinion. The risk is low until you try to foreclose or the borrower really DOES want to rescind within the first three years.
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The more you sweat in training, the less you bleed in battle.......