Well know affliction of a Barista's wrist who still use the old fashion
coffee/espresso machines due to the repeated
motion of twisting the filter handle on and off on the group heads. The
pain is similar to carpal tunnel but does dissapeat after a while. Prevalent in newbee Baristas in training. Was alleviated a bit with the invention of the right angled version and now eliminated with the arrival of fully electronic espresso machines.