I got the Clearly Perfect Angles tool. It is a vinyl sheet that clings to the bed of your sewing machine by static cling so can be easily installed and removed. You line up the needle in normal position with the center line of the guide and then can place fabric on the 1/4 inch line. It is about 8 inches long so can extend a long way down the front of the machine or table to aid in guiding. Also works perfectly for half-squares and other angled sewing. I have a drop in bobbin so had to cut out a section in the middle to fit over the cover but easy to do with the instructions provided. Now my seams are much better than when I used the 1/4" foot.