Head rest release?? (pics)

I've used a thin feeler gauge to slide over the notches as I pull the headrest out. Pull the headrest up all the way. Then wrap a thin feeler gauge (well lubed) around the shaft and work the whole thing back down into the seat back. Hold the feeler gauges down and pull up on the headrest. The feeler guage shoud cover the detents and allow the headrest to come out.