Transport-Lock Screw for Thorens TD-318

Does anyone know where I can get a replacement Transport-Lock Screw for a Thorens TD-318? Or even where I can find out what size screw it was?

If I cannot find a replacement, how big a deal is it to transport the turntable without the transport-lock screw? I'm moving, and planning on having the turntable in the car with me, packed as well as I can for a 4-hour drive.

Thanks for your help,