I had limited camera access, but I bought a Troybilt 6.5HP Lowes Self Propelled Mower for my neighbor. The previous owner stated fuel was leaking out of the primer bulb. After cleaning the carb 2 times I found out that Briggs and Stratton uses a rubber o ring for a needle seat instead of metal or brass like many carburetors. I used a small phillips head screw driver and wedge the head into the old o ring with a twisting motion and twisted the old o ring out. After buying the part # 398188 part or 49-036 Needle and Needle Seat Kit the mower runs like new.