Are you sure the brushes are that wide? Normally you are looking for an arc in the brushes that matches the arc of the commutator segments. Once the two arcs are the same you have full contact and are good to go. You really need a view from the end of the shaft or a small mirror to view this. You can also pull the brushes out periodically during your break-in and see if any of the original flat area across the bottom (where the brushes touch the commutator) is left. If it's all gone your motor is ready.
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