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I got tired of using various cutting devices and straight edges to make long straight cuts. Too often the cutter drifted away from the straight edge or leaned to the side giving me an edge that was not square. When the cutting device touched a metal straight edge it would dull it. This was my solution. I purchased a Logan mat cutting ruler and straight cutter. I tried using the cutter and ruler the way it came but my results were mixed. The cutter travels in a groove in the ruler. I did not like the fit but the idea was sound. I removed the blade holding part of the cutter and screwed it to a small block of UHMW plastic. UHMW plastic is similar to cutting board plastic just denser. I cut my own groove in the block but produced a lip that provided a very snug fit in the ruler. UHMW is very low friction material so even though it is a tight fit it slides easily with no side play. The block's edges were rounded over and the bottom sanded smooth. The block travels in the ruler's groove,presses down on the leather and maintains the razor cutting edge perpendicular to the face of the leather. Because the block is so smooth it does not damage the surface of the leather at all. I mounted the ruler to a 2' x 4' piece of poly board I had. I attached flathead screws from the bottom of the surface to line up with the holes in the ruler. The nuts holding the screws fit under the recess of the ruler allowing it to lay flat. The ruler is removable. It is lifted up to position the piece and then dropped over the bolts. This eliminates any side to side movement of the ruler. I also cut a groove in the cutting board surface to provide clearance for the razor cutter. The cutter never contacts the cutting surface which really cuts down on blade drag and increases the life of the cutter. It works better then I had hoped for. The bottom of the ruler has rubber strips which help keep the leather from slipping. The blade holder has two depth setting which allow the blade to project 5/16" (20/64") deep. I have cut 12 oz. bridle with little effort. When I use it I press down on the ruler which holds the leather in place and slide the block with moderate downward pressure. It works so well I can even cut lace with it (1/4' wide see photos). Since both edges of the ruler are parallel I use a large square on the opposite edge when I want to make right angle corner cuts. Jim