The laptop hard drive I'm trying to fix is dying soon. I happen to have a same model, size, type and brand hard drive in an external enclosure which has even less start/stop cycles, is younger and 100% healthy. Now I am inveigled to image the old drive on the healthy one and open the laptop, replace it. But I don't want to void warranty. 

I know from thinkpad laptop screws (which are black colored), you can tell if they were ever unscrewed from the scratches on the color. 

Is there a way to unscrew screws without them telling stories from the scratches they receive? I can't beam the drive into the laptop but i really want to replace it and give the owners a working laptop back without them loosing warranty rights.