You have now reached the iris assembly. The blades are fixed in position, they do not jump out easily, but be careful when touching them. Look at the 3rd picture, on the top you can see the irs gears. The metal gear is moved by the motor, and it moves a second small plastic gear , and this one moves the iris plastic ring.

You can check if the blades are sticky, and if the gears are damaged. You can switch on the camera, and push the shutter button , you will see the blades moving and check if all is ok (don't touch them while moving, they are very thin).

If you fully open the iris, you can clean the lens, if needed, without removing the iris.