I am cutting out 2 1/2" diamonds and thought I would use my Easy Six ruler that I have had for years and never used. Cut my strips and then cut the diamonds on the 2 1/2" line. They looked bigger that the 2 1/2" strips that I had just cut. Put one on top of the strip and it was bigger. I then measured the ruler against my tape measure. Wait a minute, 2 5/8"! Used two other rulers, same thing. The packaging that the ruler came in is an a box somewhere, and would take too long to find. Before I cut the diamonds down, am I supposed to use a larger seam, or do something else to compensate for the larger portion? Want to have the pieces fit when I put them together. (Don't laugh so loud, you want that dream too!) Advise please. Thank you in advance.