Thanks for reminding me about the quarter inch ruler! I bought it some time ago, and used it a few times, then I discovered the magic 4 at a time HST...a real time saver...so my ruler got stored in a drawer. I bought the Bloc Loc some time ago as well, but forgot about it until I started a quilt with 15 church dash blocks, and then remembered I had that ruler, but I was using it incorrectly...not putting the groove on the flat side, so it was wobbly. Of course it makes perfect sense to push it up against the "bump?! Thanks for that reminder!!