Here's a great tip we received from Beth Newman on making your own braille erasers.
I make braille erasers by using a small golf tee and making the end less pointed by smoothing it out with sandpaper or a file.
I then screw in a hook or ring, the kind that is used with wire attached to the back of pictures to hang them.
The hook or ring is attached to the end and I then attach it to a key ring or to the handle of a Perkins braille writer. You could also wear it like a pendant on a leather strap with maybe a bead to make it look nice, or maybe on a plastic coil around the wrist?