Now for the fun.. take the two 4 7/8" squares, put the right sides together and even the edges up. Now take a pencil or fabric pen and mark a diagonal line from top left to bottom right corner. This is the guide and cutting line for our corner squares. you're going to put the edge of your 1/4" foot on that line and stitch 1/4" on either side of that line.
Next you're going to cut on that line, leaving 1/4" seam allowance on each side. You need to make 2 of these square units.
here are the two squares right sides together.
now mark the diagonal
stitch on either side 1/4" away.
now don't be afraid.. cut on that line you marked.. and TA DA!!!!