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This video is the first part of a two part video, I recommend watching this first part first before the last part to avoid confusion.
These are some tricks and tips to help you in fixing power tools.
The tips are:
1. Swapping carbon brush connection reverses the spin of the armature
2. Where the wire goes IN or OUT in the armature slots does not matter as long as you can change the carbon brush connections.
3. The starting and finish connection of an armature coil on a commutator can be interchange as long as it is in the right segments
4. Finding the right segments using a growler
These tips were based from experiences from my father, as he is my mentor in fixing power tools.