On the 1100, the nut is on the right, axle passes in/out left to right, so ya have to move the left muffler to remove it. Not supposed to need to as the "divot" in the bottom should let it pass. But...
On the 1300, the nut is on the left, axle passes in/out on the right. The right mufflers do NOT have a divot so ya have to swing the right muller out'a the way.
Some (don't know how many) of us with 1100s now find the muffler has subsided enuff ya can't get the axle out without moving the left muffler.
Not a criticism of your OP, just wanna make sure we're both saying the same thing...