BB8 We may be onto something here! I'm actually heading towards fencing Sabre blades instead of actual fencing foils because the Sabre blades are round. Google fencing sabre some pictures even have the blade out of the hilt with a smaller rod at the base they look very close to the saber prop blades on the table that could explain some things we see even on the Vader ROTJ saber.
I agree. They also make fencing firs round as well.