The rubbers are held into the plastic by 2 pretruding edges into the plastic shaft.
Look down the bottom and you will see 2 squares, push them in and dig the rubbers out. They maybe a lil tight from new, but once they have been in the car for a few days they will f**k up like the last ones!
I took mine out, added some superglue and popped them back in, they never came out again.