Anyone know what size hex key fits these? The wire that goes into the hub that steers the tw. I haven't been able to find one small enough yet and the wire fell out.

My 1.5mm ball driver works, but not the 1.5mm Craftsman hex key. Maybe my hex key isn't really 1.5mm.

1.5mm works on the main shaft screw which is on the side. I'm talking the set screws that hold the steering wire which you access from top and bottom, there's two of them that are smaller.

Sorry, I was picturing the MK tail wheel.