I use the Quilters Slide Lock for all my rulers. It keeps the ruler from moving and you will never have to worry about cutting your fingers. Always use some type of safety cutting tool when you cut with a rotary cutter. The cutter can jump in a blink of an eye. If you have a heavey broken iron don' t throw it out. It will work to hold a long ruler in place when cutting strips, I taped some sandpaper on the bottom of the iron and it will not slip on the ruler It will work until you can buy a nicer tool. Rotary cutting your finger is scary and it hurts!