The Dolphins added some much-needed depth on the offensive line on Wednesday when they signed former Buffalo Bills guard Jamie Nails.<p>Nails was signed after coming back to the Dolphins' training camp headquarters for a second workout.<p>

Nails had worked out for the Dolphins less than two weeks ago, but was deemed too heavy at the time.

Nails is listed at 6-6, 360 pounds. He is a fifth-year veteran who spent his first four NFL seasons with the Bills after joining the team as a fourth-round pick out of Florida A&M in 1997.

Nails started all 16 games at right guard last season, giving him 22 career starts.

He won't start for the Dolphins, unless the team decides to move starting left guard Mark Dixon to left tackle, which would create a vacancy at guard.

Dixon has indicated a preference to remain at left guard, but he played tackle in the CFL prior to joining the Dolphins and would make the switch if asked.

Marcus Spriggs, who replaced projected starter Brent Smith, is still listed as the starter on the depth chart, but Coach Dave Wannstedt has said that the position is far from settled.

"We're still working through the left tackle spot," he said. "That's totally unsettled, that position. It's an ongoing evaluation thing, and if somebody gets cut or somebody is on the market, we would look at it."

Apparently, the Dolphins can forget about Saints backup guard Tom Ackerman.

He was expected to be traded or released by the Saints after he refused to take a pay cut and he was someone who intrigued the Dolphins, who had tried to sign him as a free agent last offseason.

But Ackerman reportedly is on the verge of signing a new contract with New Orleans.

The Dolphins also reportedly have asked former Bears and Redskins starting tackle Andy Heck if he would consider coming out of retirement. Heck currently is coaching the offensive linemen at the University of Virginia.

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