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gbj_tester in reply to @lf

The original hole is obvs M4

Rly?
They are usually M5 (very occasionally M6). If you drill through 4mm, you'll probably be able to peel out the remnants of an M5 screw.

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lf in reply to @gbj_tester

Just the sort of response I was looking for. Will drill 4mm and then take it from there. I did wonder why the remnants weren't so forthcoming with the 3mm hole drilled.

Thanks

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coventry_eagle in reply to @lf

Spray some WD40 or GT85 before you drill and leave it overnight.

The broken bolt might just undo itself when you start drilling and pop out of the other end. Saves you from removing any remnants or re-tapping the threads

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