there are sandpaper dots you can get to put on the back of your rulers to keep them from slipping....also - don't try to reach too far with the rotary..move your hand along as you cut - hold the ruler firmly, cut about 8 to 10 inches then carefully walk the hand on the ruler ahead a bit so that you're now holding down the part of the ruler where you're cutting next. Cut another 8 yo 10 inches and walk your hand up more..