How does one remove the internal sill covers on a 2010 1.2 Panda? In the front I’ve removed the cover over the front wheel arch and the screw in the sill cover just in front of the B pillar put no amount of reasonable force is releasing the cover from whatever captive system is used. At one point something snapped and a cylindrical piece of plastic (see image) with a broken edge fell out onto the carpet. What’s the technique to remove the sill cover please?