In the picture you will see a small piece of 1/2" round wood dowel and some 120 grit sandpaper. What I did first is cut a small piece of sand paper about 1-inch wide and just long enough to fit around the dowel. I shaped the sandpaper around the dowel with the grit on the outside. If the sand paper isn't long enough to fit around the dowel end to end don't worry. A 5mm gap is still ok. I liked having a 1mm to 2mm for ease of handling. The fit was really tight at first so I had to put the sand paper in the well first and then stick the dowel in. After that, start twisting the dowel back and forth while holding the sandpaper. This will start widening the hole for the drip catch. Once you feel little resistance, turn the piece of sandpaper over and use the other edge. I recommend rotating the Reo at various intervals so that you don't sand unevenly. Also stop frequently and blow out the aluminum dust. Next, superglue a small piece of paper around the end of the dowel and repeat the earlier process. I recommend just supergluing the ends where the paper fits together. If it is too tight to fit the next piece of sandpaper in there you can remove the paper and continue sanding. The hole should be big enough after the second piece of paper is added and the sanding is completed. If it takes 3 or 4 layers of regular paper added don't worry. This process took me about 35 minutes with my wife shaking her head at me modifying a brand new unused Reo. I went through 7 small pieces of sandpaper in the process. Also while you are sanding, concentrate on keeping the sandpaper down at the bottom of the well so that the sides will remain even instead of slanted in. Periodically check if the Reomizer will fit and then do two more passes. Also make sure to test it with a multimeter to make sure you don't have a short before inserting the battery back in the Reo.