AC Drill Direct Wiring

I have an old dewalt drill that the switch went out on and they don't make the replacements for it anymore. I have an old switch that will work buts it's just a switch that you would put on the positive wire wire to break the circuit. So there's no 4 wires coming out of the new switch that matches up with the brushes and the windings. My question is where do I run the power supply wires to since I only have 2 wires coming from the chord and 4 wires at the motor. 2 wires to the brushing and 2 wires to the windings. I've searched high and low for an answer but I don't think I'm wording it right or something. Sorry if I'm asking a question that's been covered 100 times. But any info would be greatly appreciated thank you.