I agree with Cam's Gram. When I first bought the rotating mat, I didn't use it much. But when squaring up a lot of HST, I pulled it out and after using it a bit, I really like it. For me there was a learning curve to remember to turn the mat, not the block, when I was squaring!! Duh! And I really like a square ruler to square up (imaginge that!) especially one that is bigger than the block, so I can see how it measures and if it really is "square". For me, sometimes it is hard to see the edges when the ruler and block are the same size. I like a 6 1/2", e.g. for blocks less than that so I can see where exactly the block edges are. Just something to think about.
