Are the 4 LCD screws to fix the LCD replacement in an iPad critical? I just successfully replaced the front glass of my 3th Gen iPad WiFi, but when I cleaned up my desk, I found out I forget to use the 4 LCD screws:  



Is it worth it working another hour to open up the iPad again and place those screws in place? Or are the adhesives strong enough to keep the LCD in place?
Go back in unless you are worried you will break it the second entry.

Adhesives won't hold under vibration and shock like a screw will and the screw pressure is what helps set the adhesive in the first place.