Yes, I was just looking through a wonderful diagrammatic representation of the mechanical hand crank mirror grinding device which Professor Robert Hooke invented to create the mirror for the Newtonian telescope, which should really be called the Hookian Telescope.
Anyway, I won't get back on that track again. I can see that you are all chaffing at the butt to hear of how they grinded mirrors back in the 16-15th century.
It was actually done using a grinding device shaped like a dish. On the surface of the dish they glued sand with glue made from boiled down horse fat.
Simple eh! I could make some pretty big mirrors that way, couldn't I?
