I've just started working on a flannel rag quilt, and while cutting the squares, the nut/screw on my Fiskars 45mm Comfort Loop Rotary Cutter keeps loosening. I managed to finish all my squares, but towards the end of the 130+ squares, I had to tighten the nut after every cut. Has anyone else had this issue, and if so, any suggested fixes? I've e-mailed Fiskars and received a message that someone will get back to me within five days, so in the meantime I thought I'd ask. Thanks!