Grinding a spanner you butcherous little so and so, they dont go and put that protective finish on them for nothing and precicion make these things just so you can go and have at it with a grinder and a cutoff wheel to enlarge it to something it was never ment to be.. and then to just calmly reccomend slithering it down to a fraction of its original thickness just ot make it fit..
They make the right tool for the job dont be cheap go and get the right tool for it so next time I have to get in there with my right tools that were professionally and precisely engineered to remove those bits I dont have to fight against rounded and hacked back butchered and ruined nut and bolt heads from stripey apron cowboy back yard hacks...
(oh who am I kidding, anyone whose seen my "specialist tool box" or some of my threads have seen the things Ive hacked and butchered to get it done)
Do yourself a favor, if your going to grind the spanner use some template metal thats the right thick ness cut out roughly the shape of the spanner and put the spanner in it, work the grinder back and forth in long sweeps with a large contact patch on the disc so you get a fairly level spanner, do it on a metal bench and quench the spanner every 15 to 20 seconds or so.
when its down to the thickness you want go and get a square object that is the width of the nut or better yet a nut of the right size and carefully cut the opening of the spanner to size make sure you take the same amount of metal out of each side of the opening so you dont leave a weak spot and make sure your cuts are perfectly parallel.
It can help (if you have the tools to do so) to drill corner holes in the depth of the spanner so when you cut down to them you have some reliefe in the metal and no sudden sharp edges.


Not that I know any, just warning you in case you see one nearby.
Oh and you can remove metal to widen the jaws of one too, if that's what you want. Just don't expect it to accept monster torque on a real bolt later on without breaking and then pass a warranty inspection at the tool shop. 
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