I discovered quite by accident that I could use my old bread machine slicing guide to hold my rulers in an upright position. After discovering that I went to a couple of local thrift stores and found them for $.50. It sure beats the $20.00+ for the wood ones and it holds a lot more. I have so many rulers I need to go get some more. I went to a bazaar at church the other day and saw a holder by Pampered chef made of wood that holds the pan lids so I told the sales rep to mention it to the quilters. I have not had any problems with them warping either.