Do-It-Yourself Story

I bought a new coupler. Prior to that I watched a couple of repair videos on U-Tube. When the part came (very quickly) I used a flat blade screwdriver and tapped the broken coupler with the flat blade and hammer in a clockwise direction. It loosened up with a minimum of force. I removed the old coupler and screwed on the new one in a counter-clockwise direction. The whole job took about 10 minutes and was very easy.