New Speedometer Drive Worn out in 60 miles?

[Duke]

Has anyone else had a new speedometer drive wear out right away? This is a 18 tooth drive, I bought it as a complete unit from a reputable supplier. Car is a new build, late 1932 torque tube. Is there something wrong in my setup or is this a repo parts problem. It worked very well at first, but died after 60 miles. I likely have some metal fillings in the torque tube now.