I was watching TV and saw Nancy of Nancy's Notions using a mat to square up a block, something I always struggle with. It ran about $64 and looked so convenient. My sister-in-law who happens to work for Handi-Quilter was visiting and told me about the Collins Center-to-Trim ruler. It is $5.56 plus $3.49 shipping from a website called Spinblessing.com. I even like that name I got it and it is wonderful and thought I'd pass it on to you, just in case you'd like to take a look.