hacksaw is a great idea! But there is no space to hacksaw it from the bottom. Do you mean to hacksaw it off from the top? If I do that, it still does not look like it will solve the problem of that cylinder on the bottom, because it seems like that rusty cylinder is stuck to the granite. That big rusty thing is just a cylinder that's there, I don't see any purpose of it, it somehow just appears to be sitting there, stuck to the whole thing.
I got some new pictures. Notice the pencil eraser for size reference. I cannot imagine any tool that will fit there near that pencil eraser so i can access that green bolt. As you can see, that useless "rusty cylinder" is preventing my access to that green bolt.