simon_brooke, My friend Rob made up a jig to try to get the screws out of the field coils on the starter motor. We succeeded on three of the screws, but the second we mangled. We got the remains of it out with a screw extractor, but it means I'll have to source a replacement screw.
Inside the body, a miniature screw jack prevents us crushing it out of round.
The first screw successfully removed. It is a countersunk 3/8" UNC screw, 16 threads per inch, with an unusually steep countersink angle. It is shown lying beside its hole, on the cylindrical body of the starter motor.
Using a screw extractor to remove the remains of the mangled screw.
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