How to remove a rounded hex grub screw?

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The end of a file with the handle removed is a very good stud/bolt extractor. Drill a centered hole, lightly tap the tang in and unscrew.
 
K

Krikeyman

Measure the outside diameter, with a caliper Vernier/micrometer, accurately.

Then measure over the tips of the 3 good threads (2 pitches), this will tell us the pitch.

Both these dimensions need to be accurate.
 

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