Fein KBH 25 Repair Manual page 13

NOTE
Carbon holders can only be replaced once the electronics have been removed
Loosen screws on air guide ring and take ring out.
Drive out field coil by gently tapping the edge of the motor housing with a plastic hammer.
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FEIN REPAIR TOOLS
4.1. Removing the motor
C-SC_CSSM 2012.05
Tool:
- Torx 20 screwdriver
- Plastic hammer