Chain drilling and milling a slot tool, steel

Do not sand, drill, file, or remove parts Do not install incompatible forks ALWAYS IN SLOT Di2 WIRE: OPPOSITE SIDE OF REAR BRAKE REAR BRAKE

I want to cut a 4mm slot up to 14mm wide and 40 to 50 mm deep into end grain ash and beech I am doing it in an amateurish way by drilling

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