If you have a tool with carbon brushes open the back and look to the carbon brushes if they are worn replace both armature AND brushes together 3 benefits 1. It runs smooth again 2. more power happy batteries 3. more power longer lasting for the power assembly+switch
If you have a brushless tool there is 1 option open and clean the the switch inside is the only option to do or replace the switch stator unit depends on witch model.
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