Subclass 3/28: Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor (G11B 11/00 takes precedence) Arrangements of heads Arranging, supporting, or driving of heads or of transducers relatively to record carriers Supporting in balanced, counterbalanced, or loaded operative position, e.g. loading in direction of traverse providing transverse bias parallel to record