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Illustration #463

Use a screwdriver through the hole in the endplate to move the end of the coiled spring from the side to the top of the brush, to push it into contact with the commutator.

Explained in

    Replacing dynamo brushes

    The carbon brushes are a sliding fit in oblong holders on the dynamo endplate. Coiled springs bear against the tops of the brushes to hold them in contact with the commutator. Read more