there should be a part associated with the rotation of the tonearm that has 3 steps or stops on it to stop the motion of the tonearm swing at one of the 3 record sizes. this part should move when you move the size control. make sure all the parts associated with that are moving free. on many changers there is a friction clutch action on the tonearm movement, to prevent damage if something or someone obstruct the motion of the tonearm during the change cycle. don't get grease on that or the tonearm wont move.
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