My weed eater (Stihl FS 80) was getting to the point of being hard to start, was finally able to get the old screen out by clamping the screen in my vice and tapping the muffler with a rubber mallet to get it loose. Soaked the screen in carb cleaner for several hours and used a brass wire wheel on my bench grinder to finally clean the carbon out. Weed eater runs like new again even being 10+ years old. Bought the extra screen so I can use the weed eater and have a screen clean and ready to go.