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Generally a will does not need to be completely re-written if the change is fairly simple and straightforward. For that you can simply draft a 'codicil', which is a document that is used as a replacement for section or sections in the will. But if the changes are fairly substantial or are otherwise confusing to follow, then a rewrite is probably best--remember that this is designed for the person who will act as executor, so if they have a hard time understanding the changes, or the language is confusing and ambiguous, the executor cannot really perform his duties properly and there is a basis to potentially challenge or even throw out the will if the language is unclear.