Yes that one is SUPER easy!
Look at the front of the muffler.
See those tubes that the bolts go into?
Take a pair of pliers and pull one of those tubes straight out.
Put the biggest washer that will fit through the hole where the tube used to be on the bolt.
Bolt the muffler back on the saw.
Mike
haha,i realy like you.I didn't think something like this.With the diffuser i can't do anything right?