
First, it is difficult to find a 12" or longer ruler that is less than the advertised maximum width of 1-1/8 ". Be 1-3/16 or 1-1/4 wide. Second, only a thin 1-1/8" ruler will fit because the beveled slot that the ruler fits in is narrower. Westcott Ruler 1 -3/16" wide. I used a hacksaw to open up the beveled slots. A triangular file will also work. Before ordering, find a thin ruler that is less than 1-1/8" wide or prepare preparing to make some hacksaws.(For rulers less than 1" wide, thickness is not critical.)

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