If possible, grind or flatten the head of the damaged bolt or screw.
With a heavy hammer and centre punch, mark the centre of the bolt or screw; this will prevent the pilot drill wandering.
The extractor requires a pilot hole, start with a small Alpha left handed drill bit (e.g. 5/64’’).
If required, drill the hole out larger. It is best to use a left-hand drill for this step, as this may be enough to remove the stud without a screw extractor.
Select the correct size screw extractor for the hole, see table above.
With a tap wrench, turn the screw extractor into the hole in an anti-clockwise direction. The reverse threads force the extractor into the hole until the broken bolt or stud is forced to turn. Continue turning until the stud is removed.
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