Gail,
Here is a pic of two cases I did that show all the pieces in their appropriate places. The larger of the two thin flat pieces goes into the storage section for the cord block to mount to. There should be a screw hole in it. You can see the screw hole in that section at the top of the left case. The one on the right is upside down and harder to see.
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SteveH is correct, the 4 triangular pieces go in the corners of the main section, under the machine. The smaller of the two thin pieces usually goes in the center of the front as an additional support for the machine. This can be seen on right case. Not all cases have the front center support, the one on the left never had one.
Joe
Last edited by J Miller; 06-25-2014 at 06:18 AM.