F-1 parts won't fix it. The squeak comes from a gear assembly on the side of the mirror box. A DYI project that requires nothing more than a drop of oil in the right place. You can apply the oil without taking apart the camera, but you have to know where to apply it. Maybe ask a question on the classic camera repair forum. Lot of knowledgeable folks there:

http://www.kyphoto.com/classics/foru...tml?1365156882

Jim B.