cub cadet cc4175 trimmer, how to get spark arrestor off of muffler?

[Rays]

Can not figure out how to get the muffler off trimmer without removing front cover? I want to get to the spark arrestor without removing muffler or front cover. Any suggestions?

 

[mechanic mark]

http://www.cubcadet.com/wcsstore/Cu...ers manuals/residential/CC4175_769-03534A.pdf see page 7, engine cold, remove spark plug boot, you may need to purchase a spray can of liquid wrench penetrating oil and let it soak in an hour or so.