Thank you all for your encouraging words!
Well I own an old hollow grinder workshop that was build up in 1869 and was run for 4 generations. The last grinder stopped working in that workshop in 1989. It was kept together, proper and safe in its original place in the backroom of a shop. When I met the grinder several years ago and he showed me his workshop, I immediately felt in love with it. Since then I visited him several times a year to discuss and learn from him about the ancient craftsmanship of hollow grinding and polishing and restoring of straight razors. Finally I bought the whole workshop, dismounted it and rebuild it exactly in the same manner in a separate room in my house.
So all of the material I use for restoration of my razors is old material from the workshop. The bench grinders are driven via transmission. The workshop is a typical so-called “Hamburg way” grindery. There are different ways of grinding that had been established in the past in Germany, mainly the Solingen way and the Hamburg way. But I think that goes a bit too deep now and off topic to this thread. I may start a separate thread about this soon, if there is an interest. I will also post some pictures then of the workshop and the equipment.
Regards Peter