As others have said, remove o-ring, then I slipped a card in btwn the clip and body to minimise scratches when removing clip.
Then with the body facing up, rest the clip on a hard surface (like a workbench) and tap down slowly on the body (unscrewed bezel end), it should slip out eventually. However some might be very tight though, and be careful cos there's also a small 'T' shaped piece of plastic thats supposed to wedge the clip tightly in place. Don't lose that if you want to put it back eventually.