This is an official Eureka belt, correct for my model 4870 vacuum cleaner. But it didn't work well because it was too tight (maybe 5mm shorter in circumference ). , probably due to differences between batches. The strap was model 71367B, lot M0006 EU Style R, bought in July 2012. It was very difficult to flip the switch between the floor and the carpet because the tension was too much. When moving to a vertical position, the automatic strain relief did not work. In an upright position and on a…