The left hand side of our fridge was hard to close no matter what we did and it was just getting worse and worse. Once I figured out what the part was, we replaced the mullion hinge piece and the pivot block just to be sure. The only tool we needed was a nut driver - I was not sure we had one but ended up using a screwdriver with an interchangeable head, without the head piece in, it's basically a nut driver the exact size of this screw. I cannot believe we waited as long as we did to take care of this problem. The fix was so simple I was annoyed we have been living with this being an issue for so long when the solution was so simple.