Duke Preston looking forward to weekend with playbook

Duke Preston, the center/guard the Cowboys picked up this week, probably won't play Saturday against San Francisco. But he expects to have an extremely productive weekend. "I'm going to pretty much not sleep and dive into the playbook this weekend and be ready to go Monday," Preston said. The 6-5, 320-pound Preston's goal is to establish himself as the offensive line's "sixth man." He made 20 starts in four seasons for the Bills, splitting time at center and guard. He also has limited experience at tackle. Preston is probably competing with Cory Procter for a roster spot. Procter has the advantage of significant experience in Jason Garrett's system, having started two games at center in 2007 and 11 at guard last season. But Preston would make less than half as much as Procter, who would have a salary of $1.54 million, and the general manager might strongly consider money since he also happens to be the man writing the check. The Packers si...