Help with starter

My ignition broke last August and I haven't got around to fixing it yet (the gears inside are stripped), so I've been starting with the ignition switch using a screwdriver and I went out to start it the other day and it wouldn't, so I had to get underneath and start it by touching both posts with a screwdriver, so does anyone know why my ignition switch won't work, it should be fine i just got it replaced, and just went and bought a new one and tried it but same problem. Help me out please.