fine-tune


fine-tune (http://definr.com/fine-tune)

     v 1: improve or perfect by pruning or polishing; "refine one's
          style of writing" [syn: polish, refine, down]
     2: adjust finely; "fine-tune the engine" [syn: tweak]
     3: make fine adjustments for optimal functioning "calibrate an
        instrument" [syn: calibrate, graduate]