I have been trying to master the illusive 1/4" seam ever since I've started quilting. I used a 1/4" foot and was so careful to have the fabric running right up to the little guide. But still my blocks came out too small every time!
Well, I bought two items, and used them, and NOW I am able to piece with a scant 1/4". It turns out that my 1/4" foot was NOT a true 1/4"...it was too wide.
So just thought I'd share what I purchased that made it possible to achieve this. It is a little ruler that you drop your needle into the hole and it measures the scant 1/4"...no guessing. Then you use the seam guides to stick down on your machine to guide the fabric against. Works like a charm.
Hope this helps someone.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1