Well I got one of these today and I read all the stuff about precision engineering and how finely tuned it is but mine clunks, the inner ball has about 1.5-2mm horizontal movement and the little plastic bits came off the string so I can't start it. I actually have chronic rsi in my right wrist (data input 14500kdph! before it kicked in) and tennis elbow as a bonus so was rather hoping this thing might help with light use.
So I'm assuming the clunking is wrong and I need to return it. Can anyone confirm if the inner ball is supposed to clunk up and down? It's the signature version.