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Jun 15, 2023 at 12:56 comment added vidarlo My guess is broken drill bit and some swear words.
Jun 13, 2023 at 19:17 comment added pateksan @MaplePanda good point. In practice the tip of the drill bit would probably just slip into the gap between the ball and the corner of the hex slot. I guess what happens next depends on the relative hardness and friction between the screw, ball, drill bit and the rust and grit the OP mentioned. It would probably be a matter of trial and error with different drill bit sizes, as well as angles - parallel with the screw thread may not necessarily be the best.
Jun 13, 2023 at 17:20 comment added MaplePanda It may be challenging to get a hole started with a drill. It ain’t easy to drill into hard, convex spherical surfaces.
Jun 12, 2023 at 20:50 history edited pateksan CC BY-SA 4.0
Minor rewording
Jun 12, 2023 at 20:36 history answered pateksan CC BY-SA 4.0