Hello, I have a T BIlt lawn mower that the carb is leaking on. It has one of those stupid like O sensor type deals on the bottom of the bowl. Does any one know how to take these off, or do you have to have some "special tool" to take it off. It has a 20 HP Kohler engine on it any ideas on how to get it off by myself. I would mess around with it but I do not want to mess it up. Cheers