Rolling chairs...I'm sure most of us have a story or two to share. Mine didn't take place in a sewing room...I was working. The building that housed our office controlled the heat...it was cold enough that all of us used those small ceramic space heaters in the footwells of our desks and we really used them evidently because when I found myself on the floor we discovered that I hadn't really broken the chair...it failed because the plastic had weakened in a stress point due to the heater. We had to replace 4 chairs! Be cautious with those tiny space heaters...they're probably not intended for 10 hour non-stop daily use while aimed at the wheels of a rolling chair.