Question: To attach a 12 volt DC adapter to the power wires inside the cordless drill.
Option 0: Cut the end of the adapter and strip the casing off using a pliers. Splice the stripped ends of the wires in the drill and the wires from the adapter by twisting both of them together. Cover with electric tape to prevent shorting out.
Option 1: Cut the end of the adapter and strip the casing off using a pliers. Splice the stripped ends of the wires in the drill and the wires from the adapter by twisting both of them together. Cover with masking tape to prevent shorting out.
Answer: 0