The 2nd photo in Brockie's post #6 shows the clutch release mechanism. The diamond shaped plate is held on by two bolts, top and bottom. When it is removed you will note that the adjusting screw and locknut, (parts 3 and 4), are threaded into the inner portion, which is the worm gear, a cylinder with three grooves wrapped helically around the circumference. They correspond to the grooves inside the outer piece, with a sleeve of tiny ball bearings riding in those grooves. Some grease there every now and then will greatly smooth out the clutch operation, but be very careful rotating the two sections apart. Those ball bearings can get away from you, and are very difficult to deal with.(eg. what locoblanco said about the actuator being installed in its outer housing 180° out)
If it has never been apart before, and the problem is recent, there is no reason to think its presently assembled wrong, but if you take it apart it can go back together 2 ways.