The handle has been wobbly lately. I figured I just needed to tighten the screw but to my surprise it was plenty tight. I ended up taking the screw all the way out but the handle is still stuck. I think it might be corroded in place which is means the guts inside are what's wobbling which probably means replacing the works.

Any advice on getting the handle off so I can see what's going on? WD-40 and hammer?