How long had you been working on the GO?????? The above hints are perfect advice. Do you think maybe that there was an underlying problem that surfaced when you did the repetitive action of cranking. I have a GO, have had for over 2 yes...do not use daily, but do use it consistently...when I do, it is for several hours, fortunately I do not have any arthritic problems, so I do not end up in pain, just happy I was able to get project done quickly and accurately. Hope your physical problem will be short-lived. Don't anything about the Sizzix.