I have a great idea! go to quilters cache. in patterns check out the 10 inch blocks. make one of those then put a border on it so you end up with a 12.5 inch block. this way if your 10 inch is say 1/8th an inch or a 1/4 inch too big too small you can adjust that border to make it work to be a 12.5 inch block! tada! just a thought but a good one. I have done this myself
