+John Mudd Tried that mate, but I noticed it still wouldnt cut properly due to the shortened length. If you look at the edge of the plate and the way it wears down, it actually wears rounded quite evenly (makes sense since it rotates), and changing sides wont give you back depth of cut. The new plate is considerably longer, and you have to reset the depth gauge all the way to the other end.
nope, as is. a worn blade looks "sharpened", but a new edger blade has to have a thick edge otherwise it wont last very long at all being hit against bricks/concrete/etc.
Just measured it up: 13mm (or 1/2" if in US), but remember it's reverse thread due to rotation of the blade. It's also a flange nut (has the lip on the bottom).