I used a pair of pliers to remove it layer by layer, the final metal cast part of the base needs the base of the armrest to be prised slightly to enable it's removal. You will need a rubber insert like this to replace it with. https://www.ebay.co.uk/itm/NEW-MINI...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649