Originally Posted by sassy granny

I see where a lot of you are useing different kinds of slotted racks for storing rulers but my question is, won't they warp if left like that. I always lay mine down flat on a table when I'm not useing them. The building I sew in doesn't always have the same temperature. If I'm not sewing I don't keep the heat or air on unless the temp outsied is to the extreme. Just curious.