With a heat gun/hair dryer, warm up the covers. This will loosen up the glue that keeps the glider feet attached to the mouse.

Once hot, gently try to lift the gliders and work the edges.

To reapply, heat the gliders to make the the glue soft, then firmly hold it in place until it cools and holds its grip.

Once the gliders are removed, the screws are easily visible

Don't touch or dirty the adhesive side of the gliders, or else they won't stick back.