Removing the sliding glass from the door (see Replacing the front door sliding glass).
We take out the upper seal of the sliding glass.
Using a Phillips screwdriver, unscrew the two screws securing the frame of the rotary glass to the door.
Using a screwdriver, push the seals of the sliding glass...
... and take out the swivel glass along with the frame.
We install a new rotary glass in the reverse order of disassembly.