I also bought a new coupler with the metal ring in the center. It went on very hard and I didn't have it flush. I wondered why the motor clips went back on so hard the first time. The black rubber peice moves freely now, and it didn't move at all the first time. I just took it off and put it on again, we'll see how it goes. I guess not having them on far enough is just as bad. Thank you for the information, thought I needed to replace my transmision or something else.