ok, so im changing my AP diaphragm. i got 3 out on the 4 screws off but i cant seem to get the the forth one. i know that there is a retaining clip holding the fulcrum pin in the housing, but how do i take that off to get to the 4th screw???

thanks.

 

There is a c-clip holding the pin in place. Take that off and the pin will slide right off.