On my '63 Plymouth the left wiper stopped working (right one still works) and it can be swung freely as if a link connection is lost. The factory manual has squat on wiper info. When I look under the dash the left linkage is visible thinking the linkage might be disconnected or broke free the arm is intact and it doesn't move when I move the wiper arm. Wonder if the pivot pin attaching to the wiper blade arm is the culprit? If anyone has encountered this or has advice please lemme know. Thanks.