Island is having trouble with the blocks coming out to unfinished 12.5. I can't stress enough that with QC blocks, you have to move your needle to the right for the scant 1/4 seam. And depending on your machine - it may be a bit more than scant. Even though I use the 1/4 foot, I use the metal edge more for fabric guide, and move the needle. I hate to see you bugger up good fabric - try on some 'scrap' ...... it will be worth the effort....your blocks will come out right every time when you get the setting right.