NEW YORK -- Another of the Mets' offseason objectives has been achieved. They have rid themselves of another piece of their flawed bullpen. Two days after they shed Aaron Heilman in a trade that imported significant talent, they moved Scott Schoeneweis in an exchange that most-likely did not.

They found a taker for the veteran left-handed reliever who fell into disfavor in 2007 and didn't escape it last summer. Schoeneweis, a resident of Arizona, was dealt to the Diamondbacks on Friday for 27-year-old right-handed relief pitcher Connor Robertson. The Mets agreed to pay some of Schoeneweis' salary.

Shortly after their season ended, chief operating officer Jeff Wilpon suggested some of the personnel changes the club had in mind would constitute "addition by subtraction." Moving Schoeneweis for a 27-year-old pitcher with a modest resume appears to be that.

Robertson produced a 0-1 record and 5.14 ERA in six appearances with the D-backs in 2008. He surrendered eight hits and two walks in seven innings, striking out two. In addition, he had a 7-4 record and 5.02 ERA in 47 games with the D-backs' Triple-A Tucson affiliate.

Robertson's career Minor League record includes 29 victories, 13 losses and 24 saves, a 2.82 ERA in 217 games. He also appeared in three games in relief with the A's in 2007. Robertson was included with Dan Haren in the Oakland-Arizona trade last December.

"We're happy to acquire Connor Robertson," Mets general manager Omar Minaya said in a statement. "He has a solid Minor League track record, and he's a good addition to our system."

Schoeneweis, owed $3.6 million for 2009, produced a 2-6 record and a 3.34 ERA in 73 games in '08. In 56 2/3 innings, he allowed 55 hits, with 23 walks and struck out 34. One of the hits he allowed was a pinch-hit home run by the first batter he faced, Wes Helms of the Marlins, in the eighth inning of the Mets' final game. It provided the decisive run in the 4-2 loss that eliminated the Mets from the postseason.