Hi guys. I have a newly acquired mcculloch pro Mac 10-10. I took it apart to do some cleaning and maintenance. In the process I removed the gas tank and now I can't get it to seal back up. I tried the first time with the original cork gasket and it wouldn't seal. I figured that gasket was probably shot. I ordered a new rubber gasket and it still leaks. From what I can tell the screw in the middle of the tank applies all the pressure to the tank area and the two near the carb/handle don't do much as far as sealing. Is there some truck to making this seal up. Also is there a part number for the gasket that goes around the carb housing? When I took mine apart the previous person had used rtv to fill the gap around the upper and lower carb housing. Any help would be appreciated.