My Krups Superiore pull lever is broken again. It's always the same problem but I cannot seem to be able to remove the casing to replace the level. Can someone shed some light please?

Here's I how was able to do it. I caution that this procedure may result in the molded snap locks breaking since they do not appear to have been designed to be removed.

1. Using a wide flathead screwdriver, I pulled the rubber grip ring from around the top of the rotating unit. This allows a better view of the edge of the removable silver top.
2. I popped the silver top off of the rotating unit and set it aside. It is held in place by four molded snap locks which are noting more than plastic u-shaped extensions which attach to corresponding hooks on the rotating unit.
3. Once the silver cap is removed, I used a 3/4" spade bit to bore a comfortable hole in the top of the unit. Be careful not to remove too much material or it will weaken the attachment points of the removable silver cap.
4. I passed a screwdriver through the new opening and pushed the plastic lever mechanism towards the broken release key. When looking at the inside of the rotating unit, you will notice a plastic knuckle resting close to the inside face of the release key. Just beneath this knuckle there is a horizontal slide with some circular holes in it.
5. By forcing this slide beneath the knuckle and towards the release key, you can raise the release lever and remove the rotating head.

I hope this helps.