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.