clean spark arrestor in a Craftsman trimmer

I have a craftsman model 358.795800 bushwhacker 32cc trimmer and would like to clean the spark arrestor since I have read that it will avoid many problems.The problem is I'm not sure this unit has one and if it does I have no idea of how to access it, even though I know it resides in the muffler. I have seen videos of other brands and to access the arrestor screen all you need to do is simply to remove the muffler guard which is either a pull out cover or accessed by removing a couple of screws. But in this model I see no way of accessing the muffler short of a major dis-assembly. Can someone shed some light into how to access the screen and clean it? Is it easy to remove? Thanks