Servo Gear Help!!!!!!!!!!!

This is the first robot I’ve ever built. I need to have gears, but the axle is wobbly, so the gear attached to the servo won’t spin the gear attached to the wheel. Any suggestions? Thanks!

Yeah, stop the axle from wobbling. Get some brass or similar tubing that fits over the axle. Fix that solidly to the chassis (plenty of epoxy adhesive). Run the axle through it. Or just glue a hard block inside the chassis and drill a hole the correct size for the axle through it.