First I watched a you tube video on how to fix this on a GE microwave. I just put the new coupler over the pin in the bottom center of the microwave, lining up the flats sides. The coupler had a small nipple that kept it from going all the way in place. This is where the video was most helpful. I placed the roller ring & turntable back in the microwave even though the turntable was wobbly. Then I placed a cup of water in the microwave & started the microwave. As the turntable turned, the coupler was supposed to fall into place, but that didn't happen for me. After 3 tries I decided to put a pie plate filled with water to distribute weight more evenly on the turntable & that worked right away. The coupler fell into place & the turntable no longer wobbled!