I wouldn't worry about scant/not scant. Here's a link on how to check your
seam allowance. Make sure to use the same fabric, needle and thread than
your project. You can move your needle slightly to the right or to the left
until you get the right width. If you can't move the needle then you can
stick a piece of tape or moleskin on your machine as a guide.
How to Test Quilt Seam Allowances for Accuracy
http://www.suite101.com/content/how-...ch-seam-a58429