Just messaged the guy I bought it from, he says it's intentional. He says that by spinning the hub you can increase or decrease the tension of the Kevlar
to be fair, when I kept on turning it to see what happened, the kevlar was pulled away from the flange of the hub a bit. It might actually of been doing something
Sadly the russians didn't like to document how anything they made works
Just messaged the guy I bought it from, he says it's intentional. He says that by spinning the hub you can increase or decrease the tension of the Kevlar