Its very simple: just place the phone screen-down on a concrete surface and screw it in place with expanding Hilti bolts, then, while standing on your hands, press down your sweating brow with full body-weight against the back and use your Tyson-style-neck to push with exactly 23 ft/lbs of torque in the direction of the arrow, if you can still see it with your eyes crossed. This will not get the bloody back off, but it will help you over that final hurdle of frustration before smashing the thing with a hammer and crossing Samsung off the list forever. :3_8_13[1]: