I have installed drawer slides bought off the shelf at large stores many times before they ran smoothly with no problems. It's a different story. I have measured every hole in the drawer and frame and they are all within tolerances of the rail specs, but after installation almost all drawers do not run smoothly. They are very tight, difficult to open until they are halfway out, then it is easier. The same goes for closing, once they are a few centimeters from closing they become very tight and stick, preventing the drawer from closing with only one spring in the guide and having to push them to fully close . I gave them a very long break in period just to be sure and after a few months of use they haven't improved, they're still tight. I would NOT recommend it.
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