MSW Motor Technics MSW-MBS680H Manuel D'utilisation page 36

Install in the reverse order of removal.
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IMPORTANT: always replace the carbon brushes in pairs!
m) Blade brush replacement:
At one of the blade guides, brushes keep the blade clean while the
machine is in operation. To replace them, loosen the spring holding them
by disassembling the blade. Put new brushes in place of the used ones: