I am considering buying a manufacturer refurbished Dell Precision 7510 or 7520 that comes with no webcam. Does anyone know if it is reliably the case that a webcam may be added without significant expense? Like, does it just require installation of the webcam, a cable, and a new bezel; or might it require installation of a new motherboard, a new graphics card, etc? Buying refurbished means a little hit and miss on exactly what you get so I am trying to find if it is generally the case that I can do this or if it is not reliably the case that I can with the one that gets shipped.