A web is generally defined to be a strip of flexible material whose width is much greater than its thickness and whose length is much greater than its width. Photographic film and paper are two examples. Such webs can be easily damaged if mishandled by conveyance machinery. Therefore, web conveyance machinery needs to be carefully designed to avoid overconstraint in the connection to the web. By achieving an exact constraint connection between the web and the web conveyance machinery, not only do we avoid damaging the web, but we can also achieve precision web tracking performance that would otherwise be impossible.