He is my drawing of the metal sleeve Porsche put into out of spec crankcases. A mechanic I know has taken at least 2 of these engines apart. The lip fractures off from the body of the sleeve thereby permitting the sleeve to be pulled down the cylinder. I put an arrow to where the fracture occurs. The lip is then just a ring of metal and that is what is in my second picture.
This is not related to the Lokasil sleeve that is placed in a mold when the crankcase is cast.
