http://www.quiltinaday.com/shoponlin...ay.asp?i=20199
Looks like you are squaring the blocks up to 9" in this pattern.
Is the issue that you don't have 9" ruler, just the 9.5" square?
If yes,
-place your ruler on the block with the 1" /1" corner to your upper right.
-Find the 4.5 center mark - where it meets vertically and horizontally - and position on top of the center of the block, with the the 4.5" lines extending to the mid points on all 4 edges of the block.
-Trim the right side and top side.
-Turn the block 180degrees, and line your cut edges to the 9" lines on the left and bottom sides.
Trim the right and top edges.
-Your block should now be a perfect 9" square.
If you're unsure of the concept, try it with a scrap of fabric first.
I'm sure there are some youtube videos out there.