Shoot...I forgot the very very very most important hint to me.
When finished sewing your block to go home please double check to be sure it is 12 1/2" x 12 1/2" --- not almost 12 1/2" x 12 1/2" when you send them back.
I have a favorite "square" for this.
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Absolutely love it along with a rotating cutting mat. Don't know what I'd do without these 2 things. Don't know where I got it but wish I had 2 of them in case something happens to this one.