Dave Plowman (News) wrote:
In article ,
The Natural Philosopher wrote:
Suppose they could be repositioned - but not until I'm certain they
can't be removed.

drill and use stud extractor maybe.

Have you ever tried drilling a self tapper?

Going back to your comments about having tungsten carbide drills for
PCB's, could you get a pilot hole in the screws and open it up with the
right sized cobalt bit, freshly ground, of course?

My thinking is, that if you have one of those 12 V and tiny hand drills,
it would be ideal to control where the twist drill can wander. Just
angle the drill slightly, at 90 degrees to the direction of error, until
the tip is pointing down the centre of the screw and bring it upright again.

That didn't look right. If the twist drill is wandering to the left, you
angle it to the left, until the drill cuts back to the middle of the screw.

Dave