I live just outside Greenwood, AR and am lucky to have two quilt stores close, Mama's Log House and Crooked Creek Quilts...Crooked Creek has made their own version of these for 1/2 square triangles...taken a Plexiglas square and routered out the line for the 1/2 square seam so it fits flat when you are cutting....they get an arm and a leg for them and I've only bought the smallest one but they sure make trimming easier!!