You will find that it has what is called a "J hook".
It's easy enough to take off the arm and blade assembly in one piece, same as a car.
Then go to any decent auto parts supplier and match your old blade for new....
G'day guys, this might work, go to any auto parts shop and get a cheap telescopic magnetic pick up tool.
If needed, put a bit of tape around the outer part of the magnet to stop it catching the side of the tube.
Usually you can find a tool with a magnet head small enough to fit inside the...