I can't see any reason why the positioned tab would not work with your code but it would be problematic because you don't know the page width of every section.

If the page setup varies across sections or documents then using a static 6.5 inches as your assumed width is not going to work with every section. The 'special' alignment tabs adapt to the page setup width of every section so you could even use 'same as previous' for all footers after the first section.

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Andrew Lockton
Chrysalis Design, Melbourne Australia