Hi Peter
Not sure if this one you are talking about But Roy Underhill made one that was a copy of a museum work bench...that was cam action type...but I don't recall seeing it on a DVD just in his books...
http://www.alibris.com/booksearch?qw...*listing*cover http://www.alibris.com/search/books/...derhill,%20Roy
Swingley workbench, cam type workbench below.
http://swingleydev.com/woodworking/plans.php
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