Approxymatively with the same method as here, in Europe....
In many case, it is due to a cam wich is out of is normal position.
A little test : without AC, turn the platter as anti-hour with one hand and slowly move the arm near the center. You must listen a little "cling" one way per rotation.
After that, replace the tone arm on its basement, and try the reject mechanism, always with a manual rotation.
If it is not the solution, remove the platter and look at the cams, especially that near the axle wich is on the great wheel. When the tonearm move toward the center, another arm push this cam.