unit is on a user in general the fig4 embodiment may be operated by a single thumb or finger moving pinion gear 310 in contrast the fig5 embodiment is more readily operable by a two finger operation of the user typically the opposing thumb and finger approach also used with the present fig3 embodiment throughout fig2 5 arrows 500 generally illustrate the direction of rotation or movement of the particular actuating elements of the respective fine adjustment means while arrows 510 illustrate relative axial movement of longitudinal members 42 and 46 in response to the respective actuating elements while it is recognized that set screws and rack and pinion mechanisms are generally known in the art the present invention in its broader terms concerns particular use of such elements in a particular fashion as disclosed with each headset embodiment so as to provide fine adjustment thereof as is well understood from any one of the five presently disclosed embodiments a user may make coarse adjustment of the axial distance between side support 12 and earphone element 16 by suitably flexing elements 30 and 32 while using one of the aforedescribed fine adjustment means for making fine variations in such distance and hence coarse and fine adjustment of the pressure on the user 39 s head as exerted by side support 12 and earphone element 16 fig6 illustrates fine adjustment features 44 50 52 56 and 58 generally functioning the same as those illustrated in fig1 but operating in the reverse.