So i've been playing EUB for a while, for a few songs in our set. As I work away from home all week, I only get an hour or two to practice with the EUB at the weekends, and then not every weekend. As a result, I'm really struggling to keep my hand strength in my left hand. So my question is, do any of you folk use one of those hand exerciser things, and if so, are they any good?