Adjusting mechanism

Apparatus for fixedly orienting a member arranged to carry a magnetic head with respect to a reference plane with three degrees of adjustment, including a base member, three bores defined in said member, a screw extending through each of said bores and threadably received in means in said base member, each of said bores extending from an upper dished recess in said member and further extending from a small diameter to a larger diameter, spring means disposed about said screws in said larger diameter portion of said bores and biasing said member from said base member, said screws having heads with undersides defined partially on a sphere so that said heads engage said member in respective recesses in at least full circle line contact regardless of the orientation of said member to said base member, and a screw threadably extending through said member into contact with said base member, two of said bores being aligned with a reference line of said member and the third bore being offset with respect to said reference line and between said two bores.