Article in English: A flat head screw has one groove across the head of the screw only. If you do not have a flat head screwdriver then you can usually use any kind of flat surface to unscrew the screw. Try using a card such as a plastic credit card to turn the screw. Insert the edge of the card into the long groove and turn counterclockwise to unscrew the screw. Make sure the card is strong and old as it could be damaged in the process. Your thumbnail will only work if the screw is quite loose in the surface. Insert your nail into the groove and turn counterclockwise. If the screw is relatively loose then the screw should come out easily but if it is tight then this method likely will not work.

Summary in Hindi:
स्क्रूड्राइवर के बिना फ्लैट हैड स्क्रू निकालने के लिए इस मेथड का इस्तेमाल करें: एक कार्ड यूज करें: अपने थंबनेल (उँगलियों के नाखून) का इस्तेमाल करें: