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If none of the common methods for removing a frozen screw
work, and drilling is in order, these carbide center drills should be
used to center and "start, the hole. With the spindle at fairly high
speed, bring the center drill down to the screw head and adjust
position until centered in the screw. Apply pressure and cut until
center hole is deep enough to allow the proper undersized,
regular drill bit to start cutting without catching on the screw head
slot. Better for drilling broken taps too, for they will cut center
holes in even the hardest ones. And, because of the large body
mass of the tool relative to the small drill diameter, it is very sturdy
and rigid. Will not flex or walk.