The roller glide in your microwave rests under the microwave plate, and allows it to rotate when the microwave is running. It is a round plastic ring with 3 wheels spaced out around the perimeter. If ...
Open the shipping package the new roller guide comes in and removed it from the package. Open the microwave door and removed the glass turntable plate. Remove the broken roller guide ring and roller wheel/s. Clean the surface that the roller guide assembly rides on. Place the new roller guide assembly into the microwave. Clean the bottom surface of the glass turntable plate that the roller guide wheels ride on and put the plate back into the oven. Place a cup of water onto the turntable plate close the oven door and start the microwave. Looking through the door assure that the new roller guide assembly is rolling smoothly under the turntable plate. Stop the oven, remove the cup, reset the oven timer.