Two small screwdrivers did not work for me, perhaps because the tips were too thick; I think the tips went between the tab and the inside assembly, instead of between the tabs and the case. It's not easy to see, but the tabs engage with indented holes inside the case. I slipped two small pocket knife blades down inside, very flat against the inside of the case, and the tabs easily disengaged. The inside was very easy to push out by pressing on the tip - no hard surface or large amount of force was needed.