Screws screwed how to do screws screwed what method to solve the problem?

1, add some pressure, or change a very small strength screw;

2, with a small model of a word screwdriver, hit a deeper groove, and then turn out;

3, with a small hacksaw to saw the screws into a word, with a word screw tool to unscrew;

4, the first whole head of the screws are sawed off, or their own with aqua regia, the head of the screws to corrode off;

5, the head of the screwdriver burns red, quickly top on the screw, wait a while to screw out.