I don't think that machine actually works our hands enough. My hands don't curl like most people with myotonia--they are stiff or shake uncontrollably instead. Anyhow, that machine makes me use my hands just enough to trigger a spasm rather than enough to make it be looser. Eventually, it goes away, but that machine works my arms way more than my hands or arms. It can also cause my neck and back to spasm a bit.