We had several boards hanging from the beams in our 1940's era basic fitting workshops/classrooms. The one directly in my line of sight, hanging over 'Big-John' Hessell's workbench said
'....near enough isn't good enough. But exactly right is near enough'. It's funny how you remember all these little proverbs - and try to keep to them as the years tick by. So good was our basic engineering training lessons and practical work that I still remember my class instructor, Mr Surtees and our machine shop teacher, an ex Armourer, Mr Owens.