130 begins to encounter intermediate portion 192 and upper end 190 moreover it will be appreciated that the geometry of swing limit cam 114 may be altered as desired to produce desired swing limiting characteristics for example swing limit cam 114 may be made relatively longer with more gently sloping flanks 194 to enable a more gradual limiting of swing motion relative to distance in another example opposing flanks 194 may a provided with differing slopes so as to enable a greater range of swing motion in one direction relative to the opposing direction tilt head 104 is generally attached intermediate support structure 103 and display interface structure 106 in a first example embodiment tilt head 104 generally includes inner yoke 204 pitch cams 206 and pitch member 208 as depicted in fig8 11 in a second example embodiment tilt head 104 generally includes body portion 210 a pair of inner pitch arms 212 a pair of outer pitch arms 214 and a display interface assembly 216 as depicted in fig2 32 referring to the first example embodiment of tilt head 104 depicted in fig8 11 inner yoke 204 generally includes back plane 218 defining laterally oriented opening 220 and having parallel projecting flanges 222 224 each of flanges 222 224 define upright guide structure 226 first oblong aperture 228 and second oblong aperture 230 in lateral registry across tilt head 104 each pitch cam 206 defines a guide.