[shorod]

I see you live in Ohio, so there's a good chance years of winter weather have caused the knuckle to rust to the strut body. You'll probably need to spray penetrating oil on that interface and give it quite a bit of time to soak all the way through the length of the joint. You may also need to use a chisel or similar to spread the opening slightly at the seam that the bolt holds together to help loosen it up. We're not talking a lot here, basically just enough to disturb the rust.

-Rod