According to the man who developed it, whom I met in Paducah in April, he showed me to place it beside the ruler, not on top of it. If you go to this website
www.slidelock.com there are several tutorials and demos on how to use it. I met him and his wife--he said he made it at her request and at the time they were working on developing the Sidekick template to use with it. Both of them were there working the booth.