Here is the fix/adjustment (there is nothing wrong with the arm)
remove the arm from the armboard
You will find a large screw in the middle of the base of the arm. Loosen it and sort out where the arm rest should be. Tighten the screw and reinstall the arm.
This will have a minor effect on the anti-skate, probably for the better.
remove the arm from the armboard
You will find a large screw in the middle of the base of the arm. Loosen it and sort out where the arm rest should be. Tighten the screw and reinstall the arm.
This will have a minor effect on the anti-skate, probably for the better.