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Starter motor sticking.
Check starter motor electrical connections and engine and gearbox earths. If they are good, starter motor mount bolts. If they are good, remove starter motor and see the teeth will be worn. It will be the solenoid hence checking the wiring and starter motor mounts first.
Or it could be the ignition switch electrical connection wear not disengaging the electrics quick enough.
OK hive mind, does this work?
Name that high pitched screeching noise!
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