Need help w/ B&S 9 HP vanGuard
 

I was given a Coleman generator yesterday. Gasoline is coming out the exhaust and air filter housing. I shut the gas off, finally cleared the flooding and she ran good, other than the choke had to be 3/4 closed. I disassembled the carb, cleaned everything and upon reassemble, found a screw where I think a mix screw should be. All the parts diagrams I've found do not should which screw goes into the hole that the screwdriver is pointing to. Engine is 185432-0606-E1. Any help with the correct part number will be appreciated.