Pete,
I compared again some motor shafts. You are correct. I must apologize for the mistake, that was a shot too fast.
I had difficulties in the past sometimes to install the Lionel flywheels, so I made lathe some flywheels with a hole of 2mm diameter and appropriate possibiltiy to install the cage for the Legacy sensor. That was the reason for my remark.
Carl can try to install the flywheel. If it fails, maybe you can support him.
Best Regards
Albrecht