Place a suction cup just above the home button, towards the lower section of the glass.

Press it firmly to ensure the cup has a strong seal.

Hold iPod firmly on a hard surface

Start to Lift the suction cup, and start to firmly pull constantly until the adhesive breaks, and the display comes up from the rear case.

When lifting the screen apart if adhesive is still sticking to the display you may get a razor blade to cut the adhesive.