I don't know if it will help,but I just checked on the Eflightmanuals website and they have a manual for the F4U-1 that also covers the FG-1,F3A-1 and British Corsair 1.
I've had pretty good luck with this outfit.Not having a copy of this particular manual,I can't say if it will contain the info that you're looking for.However,you can check it out by going to:
http://www.eflightmanuals.com/
Then,from the left sidebar menu,choose: Flight Manuals>Fighters-Naval
The manual in question will be on the first page.