Then I found several other minimalist Dobsonian designs in the internet and contacted people, who succeeded in large thin mirror making. So I decided to start eating carbo grains again. I want to thank all folks from the ATM list , the German ATM list and the other friends and telescope makers, who supported me in critical questions and helped, to make this thing happen. There is no other way for me to handle a 24 inch piece of glass. But some people showed, that it's manageable, provided you follow some rules when making and supporting the mirror.
Tall leathers are no good place to stay on at night.
A high focal ratio is more difficult to parabolize though. I requires a low profile mirror cell and a low rocker box as well. I have to be able to carry the mirror box myself over short distances. This asks for a low mirror box, a low secondary cage and removable altitude bearings. Enables rapid cooling of the mirror and helps against local seeing.