Don't know if it's noticeable in the photo but there is about a 1/4' gap between the bottom of the bakelite part and the aluminum part. It's flush at the top. There is a screeching noise when I turn the wheel. I've taken the grub screws out and want to pull the control head back to see what's going on. To do this I guess I'll have to remove the the nut and olive on the box. Can the olive be reused?? Anyone have any idea what could be binding?