I use the Quilter's Slidelock when using long rulers. The fabric stays exactly where you put it under the ruler. I bought it years ago when it was an Australian product, right after cutting my finger with a rotary cutter. I knew I never wanted that to happen again so got it for safety purpose. It has been one of my best purchases for quilting. I have the two sizes. The patent was bought by a US seller and then resold recently to
https://www.youtube.com/watch?v=5CisZ7inyWA