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You take the nut off the wiper arm with socket/spanner
Then slide the 2 prongs underneath the base of the arm and the end of the screw pushes onto the threaded wiper motor stalk and lifts the arm off as you screw it in!
If you go to your local motor factors and ask for a ball joint seperator it wil do the same thing but check the prongs will go under first as the sizes can vary!