Sorry for the confusion, it is the windball I have used. When working from home, I have it under my desk and roll it around as a force of habit when I feel my foot getting tight again. Got my neighbour one as well as she was suffering and she finds it has helped her
Get a Windball - one of the hard plastic training cricket balls. The seem on the ball helps massage the foot. You might also want to try acupuncture as that works for some people.