Compression F connector

[jeroent]

I am wondering how the shield of the cable makes good contact with the shield of a compression F connector. With most compression connectors a piece of plastic is pressed into the connector to keep the cable secured, but I can't figure out how the actual contact is made.

[Nermash]

Inside the connector there is a metal tube that wedges itself between jacket and shield when you push the cable in.

[amyk]

Picture which shows this clearly.