BRT, another thing that you will learn through experience is how to MAKE things fit. When the blocks are not quite the same size, they is a certain degree of it that can be either stretched or eased into place. Then the steam iron can take care of the rest. Of course, it it's a great deal off, that may be another story. I match seams, then if one piece is a little bigger than the other, I put the bigger one on the bottom, close to the feed dogs. That does the trick most of the time. Then, too, the walking foot helps for that too. Just stick with it. :lol: