Any suggestions for a good way of getting the flange flat again?
plate glass was melted on an iron slab and then polished on both sides, that method was costly now float glass is used .glass is melted on a bed of molten metal and has a verry flat surface or u can use a polished granite slabThanks, Doc.
Probably 1/8 inch over the whole length. By plate glass, do you mean decent quality glass panels, such as perchance the Morris Traveller side window panels I have here? Is it just the flatness or does plate glass indicate a surface strength?