I found that a peace of weed Wacker line can be very useful in replacing the grommet or bushing valve in a plastic gas tank that has started to leak. These are common in ATVs, garden tractor or other small engines. The small tractor that I'm working on is a Wheel Horse 520H. I hope you find this useful if you ever need to replace one of these. I was afraid using a screwdriver and pliers may damage or crack the tank.