Sharpening stone holder

If you want to get your knifes sharp again and you like to sharpen with japanese water stones, this would be a good solution to fix them at the table.
To fix the Stoneholder to the printed grinding tub, I used a M8 screw. First I drilled the printed hole bigger with a 8mm drillbit. Then I drilled a 7mm hole into the Stone holder. Then I fix them together with the screw, as shown at the pictures.

For the Stone holder I bought the model ...--> https://www.amazon.de/gp/product/B004UV76A2/ref=