Andersen user update
If you find the triangular plate is not dropping off the ball shank as easily as it used to you might want to look at the rear edge of the holes in the shank. Over time road hammering will cause a burr to form at this point effectively widening the width of the shank and causing it to bind up as you try to drop it off. The picture shows where I filed the burr off.
Take a file and remove this burr. Also look at the holes through the plate. A less burr may be forming there also.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles