Help with the Dancing Cane

Hey everyone,

A while back I picked up a metal Dancing Cane, an effect that, even though it's a bit underused, has fascinated me since I was a kid.

The thing is, it came with black thread that was pretty visible, so I swapped it out for some transparent nylon thread from a craft store, but it's still visible (less than the black) and it's tearing up my finger where I anchor it.

Any suggestions for strong and invisible thread?

Thanks in advance!!!