Pointing to his right arm, the Dodgers' Don Drysdale said last week, "I'm pitching as hard as this thing will let me." For the past 13 years that would have meant that Drysdale, whose 207 wins are the most by an active pitcher, was throwing as hard as anyone in the major leagues. But early this season Big D took a tumble in the dugout, hurt his right shoulder and went on the disabled list for seven weeks. Unable to throw for most of that time, the 32-year-old ace even talked of retirement. But he came off the injured list last week and gave promise that the only retiring he may do for quite a while will be of opposing batters. Manager Walter Alston eased the 6'6" veteran back into the rotation with a start against the Mets in spacious Dodger Stadium, and Drysdale won 3-2. In tiny Crosley Field he next took on Cincinnati and its starting lineup averaging .305. Drysdale pitched six innings, allowed three hits and gave up no runs in earning his third victory of the season. "It's not the D with the speed of other years," said Dodger Catcher Tom Haller, "but he's throwing with fantastic precision." Fastballer Drysdale always did, although the fact was often overlooked while he was allowing an average of only 2.3 walks in the equivalent of 374 complete major league games. Now without full power, he has even tighter control. "I'm just throwing for spots because my control seems to go off if I throw too hard," Drysdale says. In the first 11? innings after his seven-week layoff, he did not walk a hitter. Obviously he is throwing just hard enough, which should strike fear in the hearts of the other Western Division clubs, already feeling the sting of the Dodgers before the return of Big D.