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@mnay408
If you have a rounded counter-sunk capscrew there are two tricks not yet mentioned:
a) prep your hex-key. Often the ends are not square and the corners not sharp; grind them so.
b) use an impact-driver - the kind you hit with a hammer is best as you can adjust the amount of "pre-twist" you apply, and the amount of hit you give. If it needs a big hit, support the other end of the bolt if you can.