0.22 Benjamin 112 Pistol

Hello Airgun Experts:
I am interested in getting my Dad's subject air pistol working again. It has some missing and damaged parts.
My searches of the archives didn't answer my questions.
1. the front sight has 4 screws in it (see pic), the parts diagram i have and all diagrams i have seen show a front sight with 2 screws--was there a break in serial nos in which the front sight went from 4 to 2 screws? and where can i get a parts diagram that shows the part number for the 4 screw front sight?
2. It appears that the front sight is the piece that contains the fulcrum pin for the pump lever--that is broken on mine and i need a replacement. Is that going to be available? It is quite disheartening to see there are so many pot metal parts on this thing and how it is assembled w/ soft solder!
Any assistance would be appreciated.

Thanks,
Dennis

DSC07985.JPG


DSC07986.JPG