Replacement disc fits my RV520 perfectly with no problems. To install it, the four pieces of rubber at the corners of the front plastic panel must be removed and there are small screws underneath. You'll need a 2.4mm Philips screwdriver to pry them out, and then three screws on each side of the screen, perpendicular to the first screws you unscrewed. All in all it's pretty easy. But the screen is great, looks and works like new.
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