A lot of times customers complain about how their Speed Cube is very loose or difficult to turn. This is usually because the tension in their cube needs to be adjusted.
All you have to do is take out the Center piece from each side using a screwdriver. Then use the screwdriver to rotate the screw based on your requirements. Remember Righty-Tighty and Lefty-Loosey. Also, whatever adjustment you do on a side make sure to rotate the cube to ensure it turns to your liking. Repeat this for all sides.
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Good luck!