Screw 1 is connected by turning pair C to member 2, which turns about axis A of disk 5, and by screw pair D to member 3, which turns about axis B on the projection of the sleeve of member 4. When screw 1 is turned, member 3 is moved along the axis of screw pair D and the sleeve of member 4 is turned with respect to disk 5. This changes the setting angle of member 4 with respect to disk 5.
$497$SL,LL$