Congratulations, Arnold, that is a very unusual and wonderful engine.
It runs like a grandfather-clock in the first part of the video. Mechanically, a real piece of art.
To crack a nut it needs a material that is even harder than the nutshell, btw. So I guess you must be a really tough cookie, Arnold.
Nagelfluh??? 
Hello Thomas, thank you for the term "Nagelfluh" that is little bit harder than concrete - haha
but no joke this seller was my maturity test...
greetings over the lake, Arnold
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