Speedometer Cable not turning

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Have 31 Roadster. When I bought the car the speedometer wasn't working. Previous owner had speedo rebuilt. I took the speedometer cable out of the car, greased it, and reinstalled with speedometer. Speedo wasn't working. Checked speedo by spinning cable at transmission end and works--indicated by incremental increase in odometer. Took speedo out and drove car with cable end inside car (no speedo) and it isn't spinning. The cable is all the way "in." Any ideas?