Don't rip it out... Block your block to get that 1/8" Take a cork board and draw with a permanent marker a square the size of your unfinished block which I think you said was 9 1/2". Take push pins or regular pins and stretch the block so it fits to every corner of the drawn line. I use a lot of pins when I do this. Then spray it down with water from a spritz bottle. Allow the block to dry and it should behave and measure up for you. I always double check with my square ruler. I have easily squeezed those 1/8" shortfalls out by blocking.