ghostlymoron
Well-Known Member
I wouldn't have thought that it would make that much difference - a coffee maker is not a precision piece of equipment and rubber 'O' rings are flexible anyway. 8.5 is halfway between 8 and 9mm and is easily discernible to the naked eye. My steel rule is graduated in half millimeters.A ruler to decide between 1.48mm and 1.52mm thickness? It was hard enough to work out the 8.5mm bore! Still not ordered as I've been busy with work.