Ben Crenshaw came to the Byron Nelson Golf Classic this week searching for an answer. Now, he is searching for yet another victory.

Crenshaw played so poorly in the final round at Las Vegas last week that he was convinced he needed help - in a hurry.He promptly put in a call to his old University of Texas roommate, and club professional in Austin, Brent Buckman.

Buckman flew to Irving, looked over Crenshaw's swing, and made a simple adjustment - he suggested that Crenshaw close the face of the club on his iron shots.

Suddenly, Crenshaw began to hit solid iron shots and has fired rounds of 66-65 at the TPC-Las Colinas course to take a two-shot lead after 36 holes.

"It's scarey to make an adjustment like that in the middle of a tournament," Crenshaw said. "But I'm sticking with it."

Crenshaw's two-round total of 9-under 131 gave him a two-shot lead over Jeff Sluman (who shot 67 Friday) and first-round leader Mark Wiebe (69). John Cook and Craig Stadler, whose last victory was at this tournament four years ago, were tied for fourth at 6-under 134.

Bruce Lietzke was among those at 5-under, Mark Calcavecchia and Peter Jacobsen were at 4-under, U.S. Open champion Scott Simpson at 3-under, Masters winner Sandy Lyle at 1-under and Tom Watson at even par.

Lee Trevino made the cut at 3-over 143, the first 36-hole cut he has made in three tour events this year. The 3-over cut figure equaled the highest on the tour in 1988.

Arnold Palmer also seemed to be on his way to making the cut for the first time since last year's PGA Championship, but had to withdraw from a tournament for only the third time in his career.

Palmer was 1-over for the tournament with nine holes to play, but pulled a muscle in his rib cage at the 10th.