I just recently got a belt for a Necchi Nora. I posted on the Necchi yahoo group with the measurements and received a response suggesting the belt I should get and it works just fine. I measured the distance with string around where the belt goes and also measured the outer dimension of the old belt. I was told they use the outer belt measurement. Anyway, I just ordered a generic belt in the size suggested to me from a Necchi group member and it works fine after putting it on and adjusting the motor to it.