I used CorelDraw to design the sled, do you use any other program besides Easel? I was looking at some of the sleds online and you could cut in a grove as wide as the table saw slot and it would be easy to line it up. I have seen
the sleds online but didn’t know what you were talking about at first. Practice in which ever software that you are using and you will understand one day. Phil uses Easel and inkscape and has a bunch of videos on how to use them.