That tool won't do it as the Mini isn't listed. The big silver bit at the end needs to be replaced
with a smaller black unit that fits the Mini. Use the wanted section someone near you may
have something they can loan you. In my region (Wales and the West) there at least 2 people
who own purpose made tools. I've read of other ways of doing this using long nosed pliers
and g-clamps etc but nothing worked on my car except the proper tool that just took seconds.