flattening sharpening stones - the self made method

Lapping whet stones - the cheap, easy, zero-waste, ecological, simple, DIY method with three self made clinker bricks. Works for Japanese water stones (Naniva, Shapton, Imanishi, Shin Nagura…), hard natural stones (wästikivi…), and even for lapping stones. Complete how to guide.
For more information please open the full text & subtitles.

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- Which brick to choose?
It should be hard enough and suck water as least as possible, better, not at all.
German woodworkers usually choose so called clinker bricks. Unfortunately they are not available every where in the world. I tried with old oven bricks - too soft and too thirsty, new, normal bricks - still too soft and thirsty, chamotte bricks - hard enough but soaking water.
If someone knows other bricks possible to use for this, please share in the comments!
I end up ordering three clinker bricks from Germany.

- Why to start on concrete?
Not necessary, but it might fasten the lapping process. Also the grinding powder is not necessary. For minimalists, just three bricks can do it! And, if no corund available, simple sand will also do it :-)

- What is the soap good for?
The foam helps to get the grinding powder to come out of the wholes and keep on working. Our self made hard shampoo makes the best foam.

- How long does it take to get the bricks flat?
About on a afternoon should be enough.

- How often do you flatten your whet stones?
If i am working in my workshop, every time i sharpen, i start by lapping. On construction i usually use my hard natural stones (Wästikivi). They can do longer without getting hollow.

- How did you get this idea?
The idea came from F. Kollenrott. He wrote very detailed guides about sharpening all kinds wood working tools, unfortunately only in german. That is why, i decided to translate one of his methods into a language everyone can watch :-)

- What is Wästikivi?
I'll introduce them in my next video