I just bought a used BR600 blower. It starts and runs OK, but there is a problem. When the machine is tipped, gas leaks out. I see where the leak is......on top of the gas tank there are 2 tubes that plug into a round black disk, and the disk sits in a well on top of the tank. The disk can be removed by hand....nothing is holding it in, and when lifted the gas leaks out from there. Does anyone know what the fix is for this? Also, can a repair manual be found anywhere for this blower? I am fairly handy and like to try to fix things myself if at all possible. Thanks!