I have a Stihl HS85 hedge trimmer and I can't get the muffler off to see if the intake is clogged. I removed the two hex screws going through the muffler face and the other hex screw that can be seen from above the trimmer that goes through an ear on the muffler and attaches it to the main body. The muffler still won't budge. It feels like there is another bolt or two holding it, but where are they? I appreciate any help you can give me. Thanks to all...